23392721 has 4 divisors (see below), whose sum is σ = 25519344. Its totient is φ = 21266100.

The previous prime is 23392717. The next prime is 23392729. The reversal of 23392721 is 12729332.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23392721 - 2² = 23392717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23392729) 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, 1063295 + ... + 1063316.

It is an arithmetic number, because the mean of its divisors is an integer number (6379836).

Almost surely, 2^23392721 is an apocalyptic number.

It is an amenable number.

23392721 is a deficient number, since it is larger than the sum of its proper divisors (2126623).

23392721 is a wasteful number, since it uses less digits than its factorization.

23392721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126622.

The product of its digits is 4536, while the sum is 29.

The square root of 23392721 is about 4836.6022164325. The cubic root of 23392721 is about 285.9961896570.

The spelling of 23392721 in words is "twenty-three million, three hundred ninety-two thousand, seven hundred twenty-one".