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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

 Nominal 40 Cardinal forty Ordinal 40th Number of digits 2 Sum of digits 4 Product of digits 0 Number parity Even
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## Prime Factorization of 40

 Prime factorization 2 x 2 x 2 x 5 Prime factorization in exponent form 23 x 5 Prime factors 2, 5 Number of distinct prime factors ω(n) 2 Total number of prime factors Ω(n) 4 Sum of prime factors 7 Product of prime factors 10
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## Divisors of 40

 List of proper divisors 1, 2, 4, 5, 8, 10, 20 List of all dividers 1, 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
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 40 6.32456 Natural Logarithm (ln) of 40 3.68888 Decimal Logarithm (log) of 40 1.60206
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## Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
 Sine of 40 0.745113 Cosecant of 40 1.34208 Cosine of 40 -0.666938 Secant of 40 -1.49939 Tangent of 40 -1.11721 Cotangent of 40 -0.895083
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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 numerals ৪০ Eastern Arabic numerals ٤٠ Hieroglyphs numeralsused in Ancient Egypt 𓎉 Khmer numerals ៤០ Japanese numerals 四十 Roman numerals XL Thai numerals ๔๐
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## Translation

How do you say 40 in 38 different languages?
 Arabic أربعون Croatian četrdeset Czech čtyřicet Danish fyrre Dutch veertig Estonian blaene Faroese fýrati Filipino ápat na pû Finnish neljä­kymmentä French quarante Greek σαράντα German vierzig Hebrew ארבעים Hindi चालीस Hungarian negyven Icelandic fjörutíu Indonesian empat puluh Italian quaranta Japanese 四十 Korean 사십 Latvian četrdesmit Lithuanian keturiasdešimt Norwegian førti Persian چهل Polish czterdzieści Portuguese quarenta Romanian patruzeci Russian сорок Serbian четрдесет Slovak štyridsať Slovene štirideset Spanish cuarenta Swahili arobaini Swedish fyrtio Thai สี่​สิบ Turkish kırk Ukrainian сорок Vietnamese bốn mươi
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## Miscellaneous

 Number 40 reversed 04 ASCII Code 40 ( Unicode Character U+0028 ( Unix Timestamp Thu, 01 Jan 1970 00:00:40 +0000
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