399765972131 has 8 divisors (see below), whose sum is σ = 400654070784. Its totient is φ = 398878852680.

The previous prime is 399765972103. The next prime is 399765972161. The reversal of 399765972131 is 131279567993.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399765972131 is a prime.

It is a super-2 number, since 2×399765972131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399765972161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575666 + ... + 1063448.

It is an arithmetic number, because the mean of its divisors is an integer number (50081758848).

Almost surely, 2^399765972131 is an apocalyptic number.

399765972131 is a deficient number, since it is larger than the sum of its proper divisors (888098653).

399765972131 is an equidigital number, since it uses as much as digits as its factorization.

399765972131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489601.

The product of its digits is 19289340, while the sum is 62.

The spelling of 399765972131 in words is "three hundred ninety-nine billion, seven hundred sixty-five million, nine hundred seventy-two thousand, one hundred thirty-one".