123998931 has 40 divisors (see below), whose sum is σ = 212619264. Its totient is φ = 70547760.

The previous prime is 123998899. The next prime is 123998989. The reversal of 123998931 is 139899321.

It is a happy number.

It is not a de Polignac number, because 123998931 - 2⁵ = 123998899 is a prime.

It is a super-2 number, since 2×123998931² = 30751469778285522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123998531) 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 39 ways as a sum of consecutive naturals, for example, 216876 + ... + 217446.

Almost surely, 2^123998931 is an apocalyptic number.

123998931 is a deficient number, since it is larger than the sum of its proper divisors (88620333).

123998931 is an equidigital number, since it uses as much as digits as its factorization.

123998931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973 (or 964 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 123998931 is about 11135.4807260396. The cubic root of 123998931 is about 498.6616622336.

The spelling of 123998931 in words is "one hundred twenty-three million, nine hundred ninety-eight thousand, nine hundred thirty-one".