256674397 has 24 divisors (see below), whose sum is σ = 307599360. Its totient is φ = 213464160.

The previous prime is 256674377. The next prime is 256674409. The reversal of 256674397 is 793476652.

It is not a de Polignac number, because 256674397 - 2⁷ = 256674269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256674397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256674317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 235588 + ... + 236674.

It is an arithmetic number, because the mean of its divisors is an integer number (12816640).

Almost surely, 2^256674397 is an apocalyptic number.

It is an amenable number.

256674397 is a deficient number, since it is larger than the sum of its proper divisors (50924963).

256674397 is a wasteful number, since it uses less digits than its factorization.

256674397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241 (or 1234 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 49.

The square root of 256674397 is about 16021.0610447623. The cubic root of 256674397 is about 635.5175040259.

The spelling of 256674397 in words is "two hundred fifty-six million, six hundred seventy-four thousand, three hundred ninety-seven".