23902491 has 4 divisors (see below), whose sum is σ = 31869992. Its totient is φ = 15934992.

The previous prime is 23902469. The next prime is 23902507. The reversal of 23902491 is 19420932.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 23902491 - 2¹⁵ = 23869723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23902441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3983746 + ... + 3983751.

It is an arithmetic number, because the mean of its divisors is an integer number (7967498).

Almost surely, 2^23902491 is an apocalyptic number.

23902491 is a deficient number, since it is larger than the sum of its proper divisors (7967501).

23902491 is an equidigital number, since it uses as much as digits as its factorization.

23902491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7967500.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 23902491 is about 4889.0173859376. The cubic root of 23902491 is about 288.0587385015.

The spelling of 23902491 in words is "twenty-three million, nine hundred two thousand, four hundred ninety-one".