256977 has 12 divisors (see below), whose sum is σ = 424320. Its totient is φ = 146808.

The previous prime is 256967. The next prime is 256981. The reversal of 256977 is 779652.

It is not a de Polignac number, because 256977 - 2⁸ = 256721 is a prime.

256977 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256977.

It is not an unprimeable number, because it can be changed into a prime (256957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1977 + ... + 2102.

It is an arithmetic number, because the mean of its divisors is an integer number (35360).

2²⁵⁶⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

256977 is a deficient number, since it is larger than the sum of its proper divisors (167343).

256977 is a wasteful number, since it uses less digits than its factorization.

256977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092 (or 4089 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 256977 is about 506.9289891099. The cubic root of 256977 is about 63.5767151025.

The spelling of 256977 in words is "two hundred fifty-six thousand, nine hundred seventy-seven".