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40

Number 40 (forty) is an even two-digits composite number and natural number following 39 and preceding 41.

Properties of the number 40

Nominal40
Cardinalforty
Ordinal40th
Number of digits2
Sum of digits4
Product of digits0
Number parityEven
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Prime Factorization of 40

Prime factorization2 x 2 x 2 x 5
Prime factorization in exponent form23 x 5
Prime factors2, 5
Number of distinct prime factors ω(n)2
Total number of prime factors Ω(n)4
Sum of prime factors7
Product of prime factors10
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Divisors of 40

List of proper divisors 1, 2, 4, 5, 8, 10, 20
List of all dividers1, 2, 4, 5, 8, 10, 20, 40
Number of divisors d(n)8
Sum of all divisors σ(n)90
Aliquot sum 50
40 is an abundant number , because the sum of its proper divisors (50) is greater than itself. Its abundance is 10.
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Prime numbers

Is 40 a prime number?No
Is 40 a semiprime number?No
Is 40 a Chen prime number?No
Is 40 a Mersenne prime number?No
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Sequences

Is 40 a Catalan number?No
Is 40 a Fibonacci number?No
Is 40 a Idoneal number?Yes: I23
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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.
40 is not a Happy number
40 is a Humble number
40 is not a Münchhausen number
40 is not a Perfect number
40 is not a Perfect square
40 is not a Palindrome
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Numeric Bases of 40

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
2Binary1010002
3Ternary11113
4Quaternary2204
5Quinary1305
6Senary1046
7Septenary557
8Octal508
9Nonary449
10Decimal40
12Duodecimal3412
16Hexadecimal2816
20Vigesimal2020
36Base361436
60Sexagesimale60
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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 40 (n2)1600
Cube of 40 (n3)64000
Square root of 406.3245553203368
Natural Logarithm (ln) of 403.6888794541139
Decimal Logarithm (log) of 401.602059991328
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Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
Sine of 400.74511316047935
Cosecant of 401.3420780265868
Cosine of 40-0.66693806165226
Secant of 40-1.4993896097677
Tangent of 40-1.1172149309239
Cotangent of 40-0.89508291763791
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Number parity

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

Is 40 an Even Number?

Yes, the number 40 is an even number.

Is 40 an Odd Number?

No
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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 40 in words is "forty", meaning that:
40 is an aban number (a number without the letter a)
40 is an eban number (a number without the letter e)
40 is an iban number (a number without the letter i)
40 is not an oban number (as it contains the letter o)
40 is not a tban number (as it contains the letter t)
40 is an uban number (a number without the letter u)
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Numeral systems

How to write 40 in other number systems?
Bengali numerals৪০
Eastern Arabic numerals٤٠
Hieroglyphs numeralsused in Ancient Egypt𓎉
Khmer numerals៤០
Japanese numerals四十
Roman numeralsXL
Thai numerals๔๐
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Translation

How do you say 40 in 38 different languages?
Arabicأربعون
Croatiančetrdeset
Czechčtyřicet
Danish fyrre
Dutchveertig
Estonianblaene
Faroesefýrati
Filipinoápat na pû
Finnishneljä­kymmentä
Frenchquarante
Greekσαράντα
Germanvierzig
Hebrewארבעים
Hindiचालीस
Hungariannegyven
Icelandicfjörutíu
Indonesianempat puluh
Italianquaranta
Japanese四十
Korean사십
Latviančetrdesmit
Lithuanianketuriasdešimt
Norwegianførti
Persianچهل
Polishczterdzieści
Portuguesequarenta
Romanianpatruzeci
Russianсорок
Serbianчетрдесет
Slovakštyridsať
Sloveneštirideset
Spanish cuarenta
Swahiliarobaini
Swedishfyrtio
Thaiสี่​สิบ
Turkishkırk
Ukrainianсорок
Vietnamesebốn mươi
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Miscellaneous

Number 40 reversed04
ASCII Code40(
Unicode CharacterU+0028(
Unix TimestampThu, 01 Jan 1970 00:00:40 +0000
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