402398931 has 12 divisors (see below), whose sum is σ = 589742216. Its totient is φ = 243877920.

The previous prime is 402398921. The next prime is 402398947. The reversal of 402398931 is 139893204.

It is not a de Polignac number, because 402398931 - 2²² = 398204627 is a prime.

It is a super-2 number, since 2×402398931² = 323849799339885522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402398931.

It is not an unprimeable number, because it can be changed into a prime (402398921) 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 11 ways as a sum of consecutive naturals, for example, 553906 + ... + 554631.

Almost surely, 2^402398931 is an apocalyptic number.

402398931 is a deficient number, since it is larger than the sum of its proper divisors (187343285).

402398931 is a wasteful number, since it uses less digits than its factorization.

402398931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108562 (or 1108551 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 402398931 is about 20059.8836237900. The cubic root of 402398931 is about 738.2763211275.

The spelling of 402398931 in words is "four hundred two million, three hundred ninety-eight thousand, nine hundred thirty-one".