399129236831 has 8 divisors (see below), whose sum is σ = 429958364640. Its totient is φ = 368318234592.

The previous prime is 399129236819. The next prime is 399129236927. The reversal of 399129236831 is 138632921993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399129236831 - 2⁶ = 399129236767 is a prime.

It is a super-2 number, since 2×399129236831² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399129236431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4485635 + ... + 4573748.

It is an arithmetic number, because the mean of its divisors is an integer number (53744795580).

Almost surely, 2^399129236831 is an apocalyptic number.

399129236831 is a deficient number, since it is larger than the sum of its proper divisors (30829127809).

399129236831 is a wasteful number, since it uses less digits than its factorization.

399129236831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9062785.

The product of its digits is 3779136, while the sum is 56.

The spelling of 399129236831 in words is "three hundred ninety-nine billion, one hundred twenty-nine million, two hundred thirty-six thousand, eight hundred thirty-one".