398975874931 has 4 divisors (see below), whose sum is σ = 399366645664. Its totient is φ = 398585104200.

The previous prime is 398975874919. The next prime is 398975874937. The reversal of 398975874931 is 139478579893.

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 398975874931 - 2²¹ = 398973777779 is a prime.

It is a super-2 number, since 2×398975874931² (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 (398975874937) 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, 195383835 + ... + 195385876.

It is an arithmetic number, because the mean of its divisors is an integer number (99841661416).

Almost surely, 2^398975874931 is an apocalyptic number.

398975874931 is a deficient number, since it is larger than the sum of its proper divisors (390770733).

398975874931 is a wasteful number, since it uses less digits than its factorization.

398975874931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390770732.

The product of its digits is 411505920, while the sum is 73.

The spelling of 398975874931 in words is "three hundred ninety-eight billion, nine hundred seventy-five million, eight hundred seventy-four thousand, nine hundred thirty-one".