256918 has 8 divisors (see below), whose sum is σ = 405720. Its totient is φ = 121680.

The previous prime is 256903. The next prime is 256931. The reversal of 256918 is 819652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 256918.

It is a congruent number.

It is an unprimeable number.

256918 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3343 + ... + 3418.

It is an arithmetic number, because the mean of its divisors is an integer number (50715).

2²⁵⁶⁹¹⁸ is an apocalyptic number.

256918 is a deficient number, since it is larger than the sum of its proper divisors (148802).

256918 is a wasteful number, since it uses less digits than its factorization.

256918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6782.

The product of its digits is 4320, while the sum is 31.

The square root of 256918 is about 506.8707922143. The cubic root of 256918 is about 63.5718491505.

The spelling of 256918 in words is "two hundred fifty-six thousand, nine hundred eighteen".