256339930 has 64 divisors (see below), whose sum is σ = 593879040. Its totient is φ = 77313600.

The previous prime is 256339921. The next prime is 256339969. The reversal of 256339930 is 39933652.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18501 + ... + 29239.

It is an arithmetic number, because the mean of its divisors is an integer number (9279360).

Almost surely, 2^256339930 is an apocalyptic number.

256339930 is an abundant number, since it is smaller than the sum of its proper divisors (337539110).

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

256339930 is a wasteful number, since it uses less digits than its factorization.

256339930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10795.

The product of its (nonzero) digits is 131220, while the sum is 40.

The square root of 256339930 is about 16010.6192884598. The cubic root of 256339930 is about 635.2413408795.

The spelling of 256339930 in words is "two hundred fifty-six million, three hundred thirty-nine thousand, nine hundred thirty".