399102131 has 4 divisors (see below), whose sum is σ = 399749592. Its totient is φ = 398454672.

The previous prime is 399102127. The next prime is 399102133. The reversal of 399102131 is 131201993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399102131 - 2² = 399102127 is a prime.

It is a super-2 number, since 2×399102131² = 318565021937482322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399102094 and 399102103.

It is not an unprimeable number, because it can be changed into a prime (399102133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322805 + ... + 324038.

It is an arithmetic number, because the mean of its divisors is an integer number (99937398).

Almost surely, 2^399102131 is an apocalyptic number.

399102131 is a deficient number, since it is larger than the sum of its proper divisors (647461).

399102131 is an equidigital number, since it uses as much as digits as its factorization.

399102131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647460.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 399102131 is about 19977.5406644562. The cubic root of 399102131 is about 736.2545904401.

The spelling of 399102131 in words is "three hundred ninety-nine million, one hundred two thousand, one hundred thirty-one".