23789921 has 4 divisors (see below), whose sum is σ = 24193200. Its totient is φ = 23386644.

The previous prime is 23789903. The next prime is 23789923. The reversal of 23789921 is 12998732.

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 23789921 - 2²² = 19595617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23789923) 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, 201551 + ... + 201668.

It is an arithmetic number, because the mean of its divisors is an integer number (6048300).

Almost surely, 2^23789921 is an apocalyptic number.

It is an amenable number.

23789921 is a deficient number, since it is larger than the sum of its proper divisors (403279).

23789921 is an equidigital number, since it uses as much as digits as its factorization.

23789921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403278.

The product of its digits is 54432, while the sum is 41.

The square root of 23789921 is about 4877.4912608840. The cubic root of 23789921 is about 287.6058176326.

The spelling of 23789921 in words is "twenty-three million, seven hundred eighty-nine thousand, nine hundred twenty-one".