399292631556 has 96 divisors (see below), whose sum is σ = 1147013726208. Its totient is φ = 105277898880.

The previous prime is 399292631537. The next prime is 399292631581. The reversal of 399292631556 is 655136292993.

It is a happy number.

It is a super-2 number, since 2×399292631556² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399292631556.

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, 3914701 + ... + 4015403.

It is an arithmetic number, because the mean of its divisors is an integer number (11948059648).

Almost surely, 2^399292631556 is an apocalyptic number.

It is an amenable number.

399292631556 is an abundant number, since it is smaller than the sum of its proper divisors (747721094652).

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

399292631556 is a wasteful number, since it uses less digits than its factorization.

399292631556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104361 (or 104359 counting only the distinct ones).

The product of its digits is 23619600, while the sum is 60.

The spelling of 399292631556 in words is "three hundred ninety-nine billion, two hundred ninety-two million, six hundred thirty-one thousand, five hundred fifty-six".