404789864 has 8 divisors (see below), whose sum is σ = 758981010. Its totient is φ = 202394928.

The previous prime is 404789849. The next prime is 404789893. The reversal of 404789864 is 468987404.

It can be written as a sum of positive squares in only one way, i.e., 394816900 + 9972964 = 19870^2 + 3158^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25299359 + ... + 25299374.

Almost surely, 2^404789864 is an apocalyptic number.

It is an amenable number.

404789864 is a deficient number, since it is larger than the sum of its proper divisors (354191146).

404789864 is a wasteful number, since it uses less digits than its factorization.

404789864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50598739 (or 50598735 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 50.

The square root of 404789864 is about 20119.3902492098. The cubic root of 404789864 is about 739.7356396827.

The spelling of 404789864 in words is "four hundred four million, seven hundred eighty-nine thousand, eight hundred sixty-four".