23842721 has 16 divisors (see below), whose sum is σ = 29030400. Its totient is φ = 19115520.

The previous prime is 23842711. The next prime is 23842733. The reversal of 23842721 is 12724832.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23842721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23842711) 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, 22205 + ... + 23253.

It is an arithmetic number, because the mean of its divisors is an integer number (1814400).

Almost surely, 2^23842721 is an apocalyptic number.

It is an amenable number.

23842721 is a deficient number, since it is larger than the sum of its proper divisors (5187679).

23842721 is a wasteful number, since it uses less digits than its factorization.

23842721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264.

The product of its digits is 5376, while the sum is 29.

The square root of 23842721 is about 4882.9008796002. The cubic root of 23842721 is about 287.8184338153.

The spelling of 23842721 in words is "twenty-three million, eight hundred forty-two thousand, seven hundred twenty-one".