90398931 has 16 divisors (see below), whose sum is σ = 137938944. Its totient is φ = 51585984.

The previous prime is 90398927. The next prime is 90398933. The reversal of 90398931 is 13989309.

It is a happy number.

It is not a de Polignac number, because 90398931 - 2² = 90398927 is a prime.

It is a super-2 number, since 2×90398931² = 16343933451885522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90398933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15486 + ... + 20508.

It is an arithmetic number, because the mean of its divisors is an integer number (8621184).

Almost surely, 2^90398931 is an apocalyptic number.

90398931 is a deficient number, since it is larger than the sum of its proper divisors (47540013).

90398931 is a wasteful number, since it uses less digits than its factorization.

90398931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5890.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 90398931 is about 9507.8352425776. The cubic root of 90398931 is about 448.8016362449.

The spelling of 90398931 in words is "ninety million, three hundred ninety-eight thousand, nine hundred thirty-one".