256990392 has 24 divisors (see below), whose sum is σ = 696015840. Its totient is φ = 85663440.

The previous prime is 256990381. The next prime is 256990399. The reversal of 256990392 is 293099652.

256990392 is a `hidden beast` number, since 256 + 9 + 9 + 0 + 392 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256990399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1784584 + ... + 1784727.

It is an arithmetic number, because the mean of its divisors is an integer number (29000660).

Almost surely, 2^256990392 is an apocalyptic number.

It is an amenable number.

256990392 is an abundant number, since it is smaller than the sum of its proper divisors (439025448).

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

256990392 is a wasteful number, since it uses less digits than its factorization.

256990392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3569323 (or 3569316 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 256990392 is about 16030.9198737939. The cubic root of 256990392 is about 635.7781948747.

The spelling of 256990392 in words is "two hundred fifty-six million, nine hundred ninety thousand, three hundred ninety-two".