404370639 has 12 divisors (see below), whose sum is σ = 585637000. Its totient is φ = 268866864.

The previous prime is 404370623. The next prime is 404370641. The reversal of 404370639 is 936073404.

It is not a de Polignac number, because 404370639 - 2⁴ = 404370623 is a prime.

It is a super-2 number, since 2×404370639² = 327031227370536642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404370649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55864 + ... + 62685.

Almost surely, 2^404370639 is an apocalyptic number.

404370639 is a deficient number, since it is larger than the sum of its proper divisors (181266361).

404370639 is a wasteful number, since it uses less digits than its factorization.

404370639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118934 (or 118931 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 404370639 is about 20108.9691182815. The cubic root of 404370639 is about 739.4801797342.

The spelling of 404370639 in words is "four hundred four million, three hundred seventy thousand, six hundred thirty-nine".