23738721 has 4 divisors (see below), whose sum is σ = 31651632. Its totient is φ = 15825812.

The previous prime is 23738717. The next prime is 23738773. The reversal of 23738721 is 12783732.

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 23738721 - 2² = 23738717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23738711) 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, 3956451 + ... + 3956456.

It is an arithmetic number, because the mean of its divisors is an integer number (7912908).

Almost surely, 2^23738721 is an apocalyptic number.

It is an amenable number.

23738721 is a deficient number, since it is larger than the sum of its proper divisors (7912911).

23738721 is an equidigital number, since it uses as much as digits as its factorization.

23738721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7912910.

The product of its digits is 14112, while the sum is 33.

The square root of 23738721 is about 4872.2398339983. The cubic root of 23738721 is about 287.3993437175.

The spelling of 23738721 in words is "twenty-three million, seven hundred thirty-eight thousand, seven hundred twenty-one".