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# 4

Number 4 (four) is an even digit composite number and natural number following 3 and preceding 5.

## Properties of the number 4

 Nominal 4 Cardinal four Ordinal 4th Number of digits 1 Sum of digits 4 Product of digits 4 Number parity Even
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## Prime Factorization of 4

 Prime factorization 2 x 2 Prime factorization in exponent form 22 Prime factors 2 Number of distinct prime factors ω(n) 1 Total number of prime factors Ω(n) 2 Sum of prime factors 2 Product of prime factors 2
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## Divisors of 4

 List of proper divisors 1, 2 List of all dividers 1, 2, 4 Number of divisors d(n) 3 Sum of all divisors σ(n) 7 Aliquot sum 3 4 is a deficient number , since it is larger than the sum of its proper divisors (3). Its deficiency is 1.
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## Prime numbers

 Is 4 a prime number? No Is 4 a semiprime number? Yes Is 4 a Chen prime number? No Is 4 a Mersenne prime number? No
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## Sequences

 Is 4 a Catalan number? No Is 4 a Fibonacci number? No Is 4 a Idoneal number? Yes: I3
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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.
 4 is not a Happy number 4 is a Humble number 4 is not a Münchhausen number 4 is not a Perfect number 4 is a Perfect square 4 is a Palindrome
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## Numeric Bases of 4

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
2Binary1002
3Ternary113
4Quaternary104
5Quinary45
6Senary46
7Septenary47
8Octal48
9Nonary49
10Decimal4
12Duodecimal412
20Vigesimal420
36Base36436
60Sexagesimal460
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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 4 (n2) 16 Cube of 4 (n3) 64 Square root of 4 2 Natural Logarithm (ln) of 4 1.38629 Decimal Logarithm (log) of 4 0.60206
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## Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
 Sine of 4 -0.756802 Cosecant of 4 -1.32135 Cosine of 4 -0.653644 Secant of 4 -1.52989 Tangent of 4 1.15782 Cotangent of 4 0.863691
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## Number parity

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

### Is 4 an Even Number?

Yes, the number 4 is an even number.

### Is 4 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 4 in words is "four", meaning that: 4 is an aban number (a number without the letter a) 4 is an eban number (a number without the letter e) 4 is an iban number (a number without the letter i) 4 is not an oban number (as it contains the letter o) 4 is a tban number (a number without the letter t) 4 is not an uban number (as it contains the letter u)
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## Numeral systems

How to write 4 in other number systems?
 Bengali numerals ৪ Eastern Arabic numerals ٤ Hieroglyphs numeralsused in Ancient Egypt 𓏽 Khmer numerals ៤ Japanese numerals 四 Roman numerals IV Thai numerals ๔
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## Translation

How do you say 4 in 38 different languages?
 Arabic أربعة Croatian četiri Czech čtyři Danish fire Dutch vier Estonian ene Faroese fýre Filipino ápat Finnish neljä French quatre Greek τέσσερα German vier Hebrew ארבע Hindi चार Hungarian négy Icelandic fjórir Indonesian empat Italian quattro Japanese 四 Korean 사 Latvian četri Lithuanian keturi Norwegian fire Persian چهار Polish cztery Portuguese quatro Romanian patru Russian четыре Serbian четири Slovak štyri Slovene štiri Spanish cuatro Swahili nne Swedish fyra Thai สี่ Turkish dört Ukrainian чотири Vietnamese bốn
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## Miscellaneous

 Number 4 reversed 4 ASCII Code 4  Unicode Character U+0004  Unix Timestamp Thu, 01 Jan 1970 00:00:04 +0000
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