256876397 has 4 divisors (see below), whose sum is σ = 268044960. Its totient is φ = 245707836.

The previous prime is 256876393. The next prime is 256876421. The reversal of 256876397 is 793678652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256876397 - 2² = 256876393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256876391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5584247 + ... + 5584292.

It is an arithmetic number, because the mean of its divisors is an integer number (67011240).

Almost surely, 2^256876397 is an apocalyptic number.

It is an amenable number.

256876397 is a deficient number, since it is larger than the sum of its proper divisors (11168563).

256876397 is a wasteful number, since it uses less digits than its factorization.

256876397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11168562.

The product of its digits is 3810240, while the sum is 53.

The square root of 256876397 is about 16027.3640065982. The cubic root of 256876397 is about 635.6841754659.

The spelling of 256876397 in words is "two hundred fifty-six million, eight hundred seventy-six thousand, three hundred ninety-seven".