23957921 has 16 divisors (see below), whose sum is σ = 26659584. Its totient is φ = 21391104.

The previous prime is 23957893. The next prime is 23957929. The reversal of 23957921 is 12975932.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23957921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23957929) 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, 68870 + ... + 69216.

It is an arithmetic number, because the mean of its divisors is an integer number (1666224).

Almost surely, 2^23957921 is an apocalyptic number.

It is an amenable number.

23957921 is a deficient number, since it is larger than the sum of its proper divisors (2701663).

23957921 is a wasteful number, since it uses less digits than its factorization.

23957921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its digits is 34020, while the sum is 38.

The square root of 23957921 is about 4894.6829315084. The cubic root of 23957921 is about 288.2812364992.

The spelling of 23957921 in words is "twenty-three million, nine hundred fifty-seven thousand, nine hundred twenty-one".