256409312 has 12 divisors (see below), whose sum is σ = 504805896. Its totient is φ = 128204640.

The previous prime is 256409303. The next prime is 256409323. The reversal of 256409312 is 213904652.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 8012791 = 256409312 / (2 + 5 + 6 + 4 + 0 + 9 + 3 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4006364 + ... + 4006427.

It is an arithmetic number, because the mean of its divisors is an integer number (42067158).

Almost surely, 2^256409312 is an apocalyptic number.

It is an amenable number.

256409312 is a deficient number, since it is larger than the sum of its proper divisors (248396584).

256409312 is an equidigital number, since it uses as much as digits as its factorization.

256409312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8012801 (or 8012793 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 256409312 is about 16012.7858912808. The cubic root of 256409312 is about 635.2986480378.

The spelling of 256409312 in words is "two hundred fifty-six million, four hundred nine thousand, three hundred twelve".