255856 has 10 divisors (see below), whose sum is σ = 495752. Its totient is φ = 127920.

The previous prime is 255851. The next prime is 255859. The reversal of 255856 is 658552.

255856 is nontrivially palindromic in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255851) by changing a digit.

255856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7980 + ... + 8011.

2²⁵⁵⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

255856 is a deficient number, since it is larger than the sum of its proper divisors (239896).

255856 is a wasteful number, since it uses less digits than its factorization.

255856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15999 (or 15993 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 255856 is about 505.8221031153. The cubic root of 255856 is about 63.4841343379.

It can be divided in two parts, 255 and 856, that added together give a palindrome (1111).

The spelling of 255856 in words is "two hundred fifty-five thousand, eight hundred fifty-six".