404642406 has 32 divisors (see below), whose sum is σ = 926219520. Its totient is φ = 115446816.

The previous prime is 404642393. The next prime is 404642453. The reversal of 404642406 is 604246404.

It is a congruent number.

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, 24520 + ... + 37556.

It is an arithmetic number, because the mean of its divisors is an integer number (28944360).

Almost surely, 2^404642406 is an apocalyptic number.

404642406 is an abundant number, since it is smaller than the sum of its proper divisors (521577114).

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

404642406 is a wasteful number, since it uses less digits than its factorization.

404642406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13788.

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 404642406 is about 20115.7253411355. The cubic root of 404642406 is about 739.6458044409.

The spelling of 404642406 in words is "four hundred four million, six hundred forty-two thousand, four hundred six".