256399894 has 8 divisors (see below), whose sum is σ = 386725248. Its totient is φ = 127491480.

The previous prime is 256399877. The next prime is 256399901. The reversal of 256399894 is 498993652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×256399894² = 131481811286422472, 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353782 + ... + 354505.

It is an arithmetic number, because the mean of its divisors is an integer number (48340656).

Almost surely, 2^256399894 is an apocalyptic number.

256399894 is a deficient number, since it is larger than the sum of its proper divisors (130325354).

256399894 is a wasteful number, since it uses less digits than its factorization.

256399894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708470.

The product of its digits is 4199040, while the sum is 55.

The square root of 256399894 is about 16012.4918110830. The cubic root of 256399894 is about 635.2908696985.

The spelling of 256399894 in words is "two hundred fifty-six million, three hundred ninety-nine thousand, eight hundred ninety-four".