399129236868 has 48 divisors (see below), whose sum is σ = 1009016205120. Its totient is φ = 122304989184.

The previous prime is 399129236819. The next prime is 399129236927. The reversal of 399129236868 is 868632921993.

It is a junction number, because it is equal to n+sod(n) for n = 399129236799 and 399129236808.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22741413 + ... + 22758956.

It is an arithmetic number, because the mean of its divisors is an integer number (21021170940).

Almost surely, 2^399129236868 is an apocalyptic number.

It is an amenable number.

399129236868 is an abundant number, since it is smaller than the sum of its proper divisors (609886968252).

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

399129236868 is a wasteful number, since it uses less digits than its factorization.

399129236868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45500436 (or 45500434 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 66.

The spelling of 399129236868 in words is "three hundred ninety-nine billion, one hundred twenty-nine million, two hundred thirty-six thousand, eight hundred sixty-eight".