The number 4
Numeral systems
Binary: 100
Septimal (base 7): 4
Octal: 4
Hexadecimal: 4
Base 24: 4
Factorization
4 = 2 × 2
4 has 3 divisors: 1, 2, 4
Sum of all divisors other than 4:
34 = 2 2
4 = 1 + 3
Sums & differences
Goldbach conjecture: 4 = 2 + 2
Characteristics
4 is a palindromic number in decimal system
4 is a palindromic number in septimal system (4)
Related primes
The 4th prime number is:
7Previous prime number:
3 — Next prime number:
5
