The Number
4
Four
Nearby Numbers
Positive, nonzero integers within three units
Scientific Notation
Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.
4e0
Reciprocal
A number multiplied with its reciprocal is one.
0.25
The reciprocal of 4.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number 4 is a palindrome.
Not A Prime Number
A prime number is a positive integer that is divisible only by itself and one.
Four is a composite number with 3 total factors (including 1 and itself). See primes in Base 10 Decimal
A Composite
Composites have more than just these two factors.
Four is a composite number with 3 total factors (including 1 and itself).
Prime Factors
The number four has the following 1 prime factor:
Prime Factorization
The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities
22
= 4
Base Conversions
The number four in 35 different bases