399907436 has 12 divisors (see below), whose sum is σ = 702090480. Its totient is φ = 199310160.

The previous prime is 399907397. The next prime is 399907441. The reversal of 399907436 is 634709993.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159491 + ... + 161978.

It is an arithmetic number, because the mean of its divisors is an integer number (58507540).

Almost surely, 2^399907436 is an apocalyptic number.

It is an amenable number.

399907436 is a deficient number, since it is larger than the sum of its proper divisors (302183044).

399907436 is a wasteful number, since it uses less digits than its factorization.

399907436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321784 (or 321782 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 50.

The square root of 399907436 is about 19997.6857661080. The cubic root of 399907436 is about 736.7494605615.

The spelling of 399907436 in words is "three hundred ninety-nine million, nine hundred seven thousand, four hundred thirty-six".