399426638608 has 40 divisors (see below), whose sum is σ = 819555500448. Its totient is φ = 187932559872.

The previous prime is 399426638599. The next prime is 399426638623. The reversal of 399426638608 is 806836624993.

It is a self number, because there is not a number n which added to its sum of digits gives 399426638608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1463635 + ... + 1714957.

Almost surely, 2^399426638608 is an apocalyptic number.

It is an amenable number.

399426638608 is an abundant number, since it is smaller than the sum of its proper divisors (420128861840).

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

399426638608 is a wasteful number, since it uses less digits than its factorization.

399426638608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257191 (or 257185 counting only the distinct ones).

The product of its (nonzero) digits is 80621568, while the sum is 64.

The spelling of 399426638608 in words is "three hundred ninety-nine billion, four hundred twenty-six million, six hundred thirty-eight thousand, six hundred eight".