256400366 has 16 divisors (see below), whose sum is σ = 401662368. Its totient is φ = 122522400.

The previous prime is 256400329. The next prime is 256400377. The reversal of 256400366 is 663004652.

It is a super-2 number, since 2×256400366² = 131482295369867912, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 106496 + ... + 108876.

It is an arithmetic number, because the mean of its divisors is an integer number (25103898).

Almost surely, 2^256400366 is an apocalyptic number.

256400366 is a deficient number, since it is larger than the sum of its proper divisors (145262002).

256400366 is a wasteful number, since it uses less digits than its factorization.

256400366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 256400366 is about 16012.5065495693. The cubic root of 256400366 is about 635.2912595285.

The spelling of 256400366 in words is "two hundred fifty-six million, four hundred thousand, three hundred sixty-six".