399129236829 has 32 divisors (see below), whose sum is σ = 596225836800. Its totient is φ = 263876659200.

The previous prime is 399129236819. The next prime is 399129236927. The reversal of 399129236829 is 928632921993.

399129236829 is a `hidden beast` number, since 399 + 1 + 2 + 9 + 236 + 8 + 2 + 9 = 666.

It is not a de Polignac number, because 399129236829 - 2⁴ = 399129236813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399129236809) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2335117 + ... + 2500205.

It is an arithmetic number, because the mean of its divisors is an integer number (18632057400).

Almost surely, 2^399129236829 is an apocalyptic number.

It is an amenable number.

399129236829 is a deficient number, since it is larger than the sum of its proper divisors (197096599971).

399129236829 is a wasteful number, since it uses less digits than its factorization.

399129236829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165842 (or 165836 counting only the distinct ones).

The product of its digits is 22674816, while the sum is 63.

The spelling of 399129236829 in words is "three hundred ninety-nine billion, one hundred twenty-nine million, two hundred thirty-six thousand, eight hundred twenty-nine".