399139278936 has 128 divisors (see below), whose sum is σ = 1013465088000. Its totient is φ = 130984705152.

The previous prime is 399139278907. The next prime is 399139278953. The reversal of 399139278936 is 639872931993.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252778995 + ... + 252780573.

It is an arithmetic number, because the mean of its divisors is an integer number (7917696000).

Almost surely, 2^399139278936 is an apocalyptic number.

It is an amenable number.

399139278936 is an abundant number, since it is smaller than the sum of its proper divisors (614325809064).

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

399139278936 is a wasteful number, since it uses less digits than its factorization.

399139278936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301 (or 2297 counting only the distinct ones).

The product of its digits is 119042784, while the sum is 69.

The spelling of 399139278936 in words is "three hundred ninety-nine billion, one hundred thirty-nine million, two hundred seventy-eight thousand, nine hundred thirty-six".