256979 has 4 divisors (see below), whose sum is σ = 268176. Its totient is φ = 245784.

The previous prime is 256967. The next prime is 256981. The reversal of 256979 is 979652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256979 - 2⁸ = 256723 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256979.

It is not an unprimeable number, because it can be changed into a prime (256939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5564 + ... + 5609.

It is an arithmetic number, because the mean of its divisors is an integer number (67044).

2²⁵⁶⁹⁷⁹ is an apocalyptic number.

256979 is a deficient number, since it is larger than the sum of its proper divisors (11197).

256979 is a wasteful number, since it uses less digits than its factorization.

256979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11196.

The product of its digits is 34020, while the sum is 38.

The square root of 256979 is about 506.9309617690. The cubic root of 256979 is about 63.5768800370.

The spelling of 256979 in words is "two hundred fifty-six thousand, nine hundred seventy-nine".