The number 4

Representation numerals

Greek numeral: δʹ

Arabic numeral: ٤

Roman numeral: IV

Numeral systems

Binary: 100

Septimal (base 7): 4

Octal: 4

Hexadecimal: 4

Factorization

4 = 2 × 2

4 has 3 divisors: 1, 2, 4

Sum of all divisors other than 4: 3

4 = 2 ²
4 = 1 + 3

Sums & differences

Goldbach conjecture: 4 = 2 + 2

Characteristics

Related primes

The 4th prime number is: 7

Previous prime number: 3 — Next prime number: 5

This number is inside of two twin primes: 3, 4, 5

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