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# 7

Number 7 (seven) is an odd digit prime number and natural number following 6 and preceding 8.

## Properties of the number 7

 Nominal 7 Cardinal seven Ordinal 7th Number of digits 1 Sum of digits 7 Product of digits 7 Number parity Odd
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## Prime Factorization of 7

 Prime factorization 7 Prime factors 7 Number of distinct prime factors ω(n) 1 Total number of prime factors Ω(n) 1 Sum of prime factors 7 Product of prime factors 7
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## Divisors of 7

 List of proper divisors 1 List of all dividers 1, 7 Number of divisors d(n) 2 Sum of all divisors σ(n) 8 Aliquot sum 1 7 is a deficient number , since it is larger than the sum of its proper divisors (1). Its deficiency is 6.
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## Prime numbers

 Is 7 a prime number? Yes Is 7 a semiprime number? No Is 7 a Chen prime number? Yes Is 7 a Mersenne prime number? Yes: M3
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## Sequences

 Is 7 a Catalan number? No Is 7 a Fibonacci number? No Is 7 a Idoneal number? Yes: I6
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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.
 7 is a Happy number 7 is a Humble number 7 is not a Münchhausen number 7 is not a Perfect number 7 is not a Perfect square 7 is a Palindrome
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## Numeric Bases of 7

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
2Binary1112
3Ternary213
4Quaternary134
5Quinary125
6Senary116
7Septenary107
8Octal78
9Nonary79
10Decimal7
12Duodecimal712
20Vigesimal720
36Base36736
60Sexagesimal760
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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 7 (n2) 49 Cube of 7 (n3) 343 Square root of 7 2.64575 Natural Logarithm (ln) of 7 1.94591 Decimal Logarithm (log) of 7 0.845098
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## Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
 Sine of 7 0.656987 Cosecant of 7 1.5221 Cosine of 7 0.753902 Secant of 7 1.32643 Tangent of 7 0.871448 Cotangent of 7 1.14752
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## Number parity

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

No

### Is 7 an Odd Number?

Yes, the number 7 is an odd number.
Total number of all odd numbers from 1 to 7 is 4
Sum of all the odd numbers from 1 to 7 are 16
The sum of all odd numbers is a perfect square: 16 = 4
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 7 in words is "seven", meaning that: 7 is an aban number (a number without the letter a) 7 is not an eban number (as it contains the letter e) 7 is an iban number (a number without the letter i) 7 is an oban number (a number without the letter o) 7 is a tban number (a number without the letter t) 7 is an uban number (a number without the letter u)
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## Numeral systems

How to write 7 in other number systems?
 Bengali numerals ৭ Eastern Arabic numerals ٧ Hieroglyphs numeralsused in Ancient Egypt 𓐀 Khmer numerals ៧ Japanese numerals 七 Roman numerals VII Thai numerals ๗
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## Translation

How do you say 7 in 38 different languages?
 Arabic سبعة Croatian sedam Czech sedm Danish syv Dutch zeven Estonian adre Faroese sjey Filipino pitó Finnish seitsemän French sept Greek επτά German sieben Hebrew שבע Hindi सात Hungarian hét Icelandic sjó Indonesian tujuh Italian sette Japanese 七 Korean 칠 Latvian septiņi Lithuanian septyni Norwegian sju Persian هفت Polish siedem Portuguese sete Romanian şapte Russian семь Serbian седам Slovak sedem Slovene sedem Spanish siete Swahili saba Swedish sju Thai เจ็ด Turkish yedi Ukrainian сім Vietnamese bảy
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## Miscellaneous

 Number 7 reversed 7 ASCII Code 7  Unicode Character U+0007  Unix Timestamp Thu, 01 Jan 1970 00:00:07 +0000
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