394918728 has 64 divisors (see below), whose sum is σ = 1002032640. Its totient is φ = 129690624.

The previous prime is 394918661. The next prime is 394918739. The reversal of 394918728 is 827819493.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 604450 + ... + 605102.

It is an arithmetic number, because the mean of its divisors is an integer number (15656760).

Almost surely, 2^394918728 is an apocalyptic number.

It is an amenable number.

394918728 is an abundant number, since it is smaller than the sum of its proper divisors (607113912).

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

394918728 is a wasteful number, since it uses less digits than its factorization.

394918728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998 (or 994 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 394918728 is about 19872.5621901153. The cubic root of 394918728 is about 733.6730670123.

The spelling of 394918728 in words is "three hundred ninety-four million, nine hundred eighteen thousand, seven hundred twenty-eight".