256959434 has 32 divisors (see below), whose sum is σ = 410572800. Its totient is φ = 120424320.

The previous prime is 256959433. The next prime is 256959457. The reversal of 256959434 is 434959652.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (256959433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317222 + ... + 318030.

It is an arithmetic number, because the mean of its divisors is an integer number (12830400).

Almost surely, 2^256959434 is an apocalyptic number.

256959434 is a deficient number, since it is larger than the sum of its proper divisors (153613366).

256959434 is a wasteful number, since it uses less digits than its factorization.

256959434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998.

The product of its digits is 1166400, while the sum is 47.

The square root of 256959434 is about 16029.9542731725. The cubic root of 256959434 is about 635.7526644627.

The spelling of 256959434 in words is "two hundred fifty-six million, nine hundred fifty-nine thousand, four hundred thirty-four".