399313631923 has 2 divisors, whose sum is σ = 399313631924. Its totient is φ = 399313631922.

The previous prime is 399313631903. The next prime is 399313631953. The reversal of 399313631923 is 329136313993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399313631923 - 2²⁵ = 399280077491 is a prime.

It is not a weakly prime, because it can be changed into another prime (399313631903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199656815961 + 199656815962.

It is an arithmetic number, because the mean of its divisors is an integer number (199656815962).

Almost surely, 2^399313631923 is an apocalyptic number.

399313631923 is a deficient number, since it is larger than the sum of its proper divisors (1).

399313631923 is an equidigital number, since it uses as much as digits as its factorization.

399313631923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2125764, while the sum is 52.

The spelling of 399313631923 in words is "three hundred ninety-nine billion, three hundred thirteen million, six hundred thirty-one thousand, nine hundred twenty-three".