390400404 has 48 divisors (see below), whose sum is σ = 933273600. Its totient is φ = 126975456.

The previous prime is 390400403. The next prime is 390400421. The reversal of 390400404 is 404004093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390400403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96429 + ... + 100395.

It is an arithmetic number, because the mean of its divisors is an integer number (19443200).

Almost surely, 2^390400404 is an apocalyptic number.

It is an amenable number.

390400404 is an abundant number, since it is smaller than the sum of its proper divisors (542873196).

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

390400404 is a wasteful number, since it uses less digits than its factorization.

390400404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4172 (or 4170 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 390400404 is about 19758.5526797891. The cubic root of 390400404 is about 730.8643068535.

Adding to 390400404 its reverse (404004093), we get a palindrome (794404497).

The spelling of 390400404 in words is "three hundred ninety million, four hundred thousand, four hundred four".