256690938 has 16 divisors (see below), whose sum is σ = 586722240. Its totient is φ = 73340256.

The previous prime is 256690937. The next prime is 256690957. The reversal of 256690938 is 839096652.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256690937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3055803 + ... + 3055886.

It is an arithmetic number, because the mean of its divisors is an integer number (36670140).

Almost surely, 2^256690938 is an apocalyptic number.

256690938 is an abundant number, since it is smaller than the sum of its proper divisors (330031302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256690938 is a wasteful number, since it uses less digits than its factorization.

256690938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6111701.

The product of its (nonzero) digits is 699840, while the sum is 48.

The square root of 256690938 is about 16021.5772631786. The cubic root of 256690938 is about 635.5311553930.

The spelling of 256690938 in words is "two hundred fifty-six million, six hundred ninety thousand, nine hundred thirty-eight".