23998491 has 16 divisors (see below), whose sum is σ = 38785920. Its totient is φ = 14544360.

The previous prime is 23998483. The next prime is 23998517. The reversal of 23998491 is 19489932.

It is not a de Polignac number, because 23998491 - 2³ = 23998483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23998411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40105 + ... + 40698.

It is an arithmetic number, because the mean of its divisors is an integer number (2424120).

Almost surely, 2^23998491 is an apocalyptic number.

23998491 is a deficient number, since it is larger than the sum of its proper divisors (14787429).

23998491 is a wasteful number, since it uses less digits than its factorization.

23998491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80823 (or 80817 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 23998491 is about 4898.8254714778. The cubic root of 23998491 is about 288.4438685053.

The spelling of 23998491 in words is "twenty-three million, nine hundred ninety-eight thousand, four hundred ninety-one".