256399918 has 8 divisors (see below), whose sum is σ = 384667920. Its totient is φ = 128177280.

The previous prime is 256399901. The next prime is 256399939. The reversal of 256399918 is 819993652.

256399918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15438 + ... + 27406.

It is an arithmetic number, because the mean of its divisors is an integer number (48083490).

Almost surely, 2^256399918 is an apocalyptic number.

256399918 is a deficient number, since it is larger than the sum of its proper divisors (128268002).

256399918 is a wasteful number, since it uses less digits than its factorization.

256399918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22682.

The product of its digits is 1049760, while the sum is 52.

The square root of 256399918 is about 16012.4925604979. The cubic root of 256399918 is about 635.2908895204.

The spelling of 256399918 in words is "two hundred fifty-six million, three hundred ninety-nine thousand, nine hundred eighteen".