256556394 has 12 divisors (see below), whose sum is σ = 555872226. Its totient is φ = 85518792.

The previous prime is 256556353. The next prime is 256556407. The reversal of 256556394 is 493655652.

256556394 is a `hidden beast` number, since 2 + 5 + 6 + 5 + 5 + 639 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 149744169 + 106812225 = 12237^2 + 10335^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 7126549 + ... + 7126584.

Almost surely, 2^256556394 is an apocalyptic number.

256556394 is an abundant number, since it is smaller than the sum of its proper divisors (299315832).

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

256556394 is a wasteful number, since it uses less digits than its factorization.

256556394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14253141 (or 14253138 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 256556394 is about 16017.3778752953. The cubic root of 256556394 is about 635.4200985605.

The spelling of 256556394 in words is "two hundred fifty-six million, five hundred fifty-six thousand, three hundred ninety-four".