256689938 has 8 divisors (see below), whose sum is σ = 387186480. Its totient is φ = 127627780.

The previous prime is 256689929. The next prime is 256689947. The reversal of 256689938 is 839986652.

256689938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256689929) and next prime (256689947).

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358148 + ... + 358863.

It is an arithmetic number, because the mean of its divisors is an integer number (48398310).

Almost surely, 2^256689938 is an apocalyptic number.

256689938 is a deficient number, since it is larger than the sum of its proper divisors (130496542).

256689938 is a wasteful number, since it uses less digits than its factorization.

256689938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717192.

The product of its digits is 5598720, while the sum is 56.

The square root of 256689938 is about 16021.5460552345. The cubic root of 256689938 is about 635.5303301048.

The spelling of 256689938 in words is "two hundred fifty-six million, six hundred eighty-nine thousand, nine hundred thirty-eight".