23993491 has 4 divisors (see below), whose sum is σ = 24017752. Its totient is φ = 23969232.

The previous prime is 23993483. The next prime is 23993503. The reversal of 23993491 is 19439932.

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 23993491 - 2³ = 23993483 is a prime.

It is a super-2 number, since 2×23993491² = 1151375220734162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23993461) 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 3 ways as a sum of consecutive naturals, for example, 10581 + ... + 12646.

It is an arithmetic number, because the mean of its divisors is an integer number (6004438).

Almost surely, 2^23993491 is an apocalyptic number.

23993491 is a deficient number, since it is larger than the sum of its proper divisors (24261).

23993491 is a wasteful number, since it uses less digits than its factorization.

23993491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24260.

The product of its digits is 52488, while the sum is 40.

The square root of 23993491 is about 4898.3151184872. The cubic root of 23993491 is about 288.4238350302.

The spelling of 23993491 in words is "twenty-three million, nine hundred ninety-three thousand, four hundred ninety-one".