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15

Number 15 (fifteen) is an odd two-digits composite number and natural number following 14 and preceding 16.

Properties of the number 15

Nominal15
Cardinalfifteen
Ordinal15th
Number of digits2
Sum of digits6
Product of digits5
Number parityOdd
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Prime Factorization of 15

Prime factorization3 x 5
Prime factors3, 5
Number of distinct prime factors ω(n)2
Total number of prime factors Ω(n)2
Sum of prime factors8
Product of prime factors15
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Divisors of 15

List of proper divisors 1, 3, 5
List of all dividers1, 3, 5, 15
Number of divisors d(n)4
Sum of all divisors σ(n)24
Aliquot sum 9
15 is a deficient number , since it is larger than the sum of its proper divisors (9). Its deficiency is 6.
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Prime numbers

Is 15 a prime number?No
Is 15 a semiprime number?Yes
Is 15 a Chen prime number?No
Is 15 a Mersenne prime number?No
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Sequences

Is 15 a Catalan number?No
Is 15 a Fibonacci number?No
Is 15 a Idoneal number?Yes: I12
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Number theory

Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions.
15 is not a Happy number
15 is a Humble number
15 is not a Münchhausen number
15 is not a Perfect number
15 is not a Perfect square
15 is not a Palindrome
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Numeric Bases of 15

In mathematics, a base or radix of a numeral system is the number of unique digits, including zero, used to represent numbers in that system.
BaseSystemValue
2Binary11112
3Ternary1203
4Quaternary334
5Quinary305
6Senary236
7Septenary217
8Octal178
9Nonary169
10Decimal15
12Duodecimal1312
16Hexadecimalf16
20Vigesimalf20
36Base36f36
60SexagesimalF60
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Mathematical operations

Mathematical operations are actions that are performed on numbers or mathematical expressions to find a numerical result.
Square of 15 (n2)225
Cube of 15 (n3)3375
Square root of 153.8729833462074
Natural Logarithm (ln) of 152.7080502011022
Decimal Logarithm (log) of 151.1760912590557
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Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
Sine of 150.65028784015712
Cosecant of 151.5377805615409
Cosine of 15-0.75968791285882
Secant of 15-1.3163300127244
Tangent of 15-0.85599340090852
Cotangent of 15-1.1682333052318
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Number parity

Parity is the property of an integer of whether it is even or odd.

Is 15 an Even Number?

No

Is 15 an Odd Number?

Yes, the number 15 is an odd number.
Total number of all odd numbers from 1 to 15 is 8
Sum of all the odd numbers from 1 to 15 are 64
The sum of all odd numbers is a perfect square: 64 = 8
An odd number is any integer (a whole number) that cannot be divided by 2 evenly. Odd numbers are the opposite of even numbers.
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Ban number

In recreational mathematics, a ban number is a number that does not contain a particular letter when spelled out in English; in other words, the letter is "banned".
The spelling of 15 in words is "fifteen", meaning that:
15 is an aban number (a number without the letter a)
15 is not an eban number (as it contains the letter e)
15 is not an iban number (as it contains the letter i)
15 is an oban number (a number without the letter o)
15 is not a tban number (as it contains the letter t)
15 is an uban number (a number without the letter u)
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Numeral systems

How to write 15 in other number systems?
Bengali numerals১৫
Eastern Arabic numerals١٥
Hieroglyphs numeralsused in Ancient Egypt𓎆𓏾
Khmer numerals១៥
Japanese numerals十五
Roman numeralsXV
Thai numerals๑๕
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Translation

How do you say 15 in 38 different languages?
Arabicخمسة عشر
Croatianpetnaest
Czechpatnáct
Danish femten
Dutchvijftien
Estonianwuiatɔ̃
Faroesefímtan
Filipinolabíng-limá
Finnishviisitoista
Frenchquinze
Greekδεκα­πέντε
Germanfünfzehn
Hebrewחמש עשרה
Hindiपन्द्रह
Hungariantizen­öt
Icelandicfimmtán
Indonesianlima belas
Italianquindici
Japanese十五
Korean십오
Latvianpiecpadsmit
Lithuanianpenkiolika
Norwegianfemten
Persianپانزده
Polishpiętnaście
Portuguesequinze
Romaniancincisprezece
Russianпятнадцать
Serbianпетнаест
Slovakpätnásť
Slovenepetnajst
Spanish quince
Swahilikumi na tano
Swedishfemton
Thaiสิบ​ห้า
Turkishon beş
Ukrainianпʼятнадцять
Vietnamesemười lăm
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Miscellaneous

Number 15 reversed51
ASCII Code15
Unicode CharacterU+000F
Unix TimestampThu, 01 Jan 1970 00:00:15 +0000
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