23923921 has 4 divisors (see below), whose sum is σ = 27341632. Its totient is φ = 20506212.

The previous prime is 23923903. The next prime is 23923931. The reversal of 23923921 is 12932932.

It is a happy number.

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 23923921 - 2¹³ = 23915729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23923901) 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, 1708845 + ... + 1708858.

It is an arithmetic number, because the mean of its divisors is an integer number (6835408).

Almost surely, 2^23923921 is an apocalyptic number.

It is an amenable number.

23923921 is a deficient number, since it is larger than the sum of its proper divisors (3417711).

23923921 is an equidigital number, since it uses as much as digits as its factorization.

23923921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417710.

The product of its digits is 5832, while the sum is 31.

The square root of 23923921 is about 4891.2085418637. The cubic root of 23923921 is about 288.1448000315.

The spelling of 23923921 in words is "twenty-three million, nine hundred twenty-three thousand, nine hundred twenty-one".