404400642 has 16 divisors (see below), whose sum is σ = 834892032. Its totient is φ = 130451760.

The previous prime is 404400631. The next prime is 404400707. The reversal of 404400642 is 246004404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1086913 + ... + 1087284.

It is an arithmetic number, because the mean of its divisors is an integer number (52180752).

Almost surely, 2^404400642 is an apocalyptic number.

404400642 is an abundant number, since it is smaller than the sum of its proper divisors (430491390).

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

404400642 is a wasteful number, since it uses less digits than its factorization.

404400642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174233.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 404400642 is about 20109.7151148394. The cubic root of 404400642 is about 739.4984682984.

The spelling of 404400642 in words is "four hundred four million, four hundred thousand, six hundred forty-two".