256331940 has 48 divisors (see below), whose sum is σ = 724852800. Its totient is φ = 67676800.

The previous prime is 256331927. The next prime is 256331947. The reversal of 256331940 is 49133652.

It is not an unprimeable number, because it can be changed into a prime (256331947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15090 + ... + 27209.

It is an arithmetic number, because the mean of its divisors is an integer number (15101100).

Almost surely, 2^256331940 is an apocalyptic number.

256331940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256331940 is an abundant number, since it is smaller than the sum of its proper divisors (468520860).

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

256331940 is a wasteful number, since it uses less digits than its factorization.

256331940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42412 (or 42410 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 256331940 is about 16010.3697646244. The cubic root of 256331940 is about 635.2347407489.

The spelling of 256331940 in words is "two hundred fifty-six million, three hundred thirty-one thousand, nine hundred forty".