394563904 has 28 divisors (see below), whose sum is σ = 894815584. Its totient is φ = 169098624.

The previous prime is 394563901. The next prime is 394563913. The reversal of 394563904 is 409365493.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394563901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439914 + ... + 440809.

Almost surely, 2^394563904 is an apocalyptic number.

It is an amenable number.

394563904 is an abundant number, since it is smaller than the sum of its proper divisors (500251680).

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

394563904 is an equidigital number, since it uses as much as digits as its factorization.

394563904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880742 (or 880732 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 43.

The square root of 394563904 is about 19863.6326989803. The cubic root of 394563904 is about 733.4532725771.

The spelling of 394563904 in words is "three hundred ninety-four million, five hundred sixty-three thousand, nine hundred four".