23809921 has 8 divisors (see below), whose sum is σ = 24231744. Its totient is φ = 23390640.

The previous prime is 23809909. The next prime is 23809927. The reversal of 23809921 is 12990832.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23809921 - 2¹⁷ = 23678849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23809927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31075 + ... + 31831.

It is an arithmetic number, because the mean of its divisors is an integer number (3028968).

Almost surely, 2^23809921 is an apocalyptic number.

It is an amenable number.

23809921 is a deficient number, since it is larger than the sum of its proper divisors (421823).

23809921 is an equidigital number, since it uses as much as digits as its factorization.

23809921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 23809921 is about 4879.5410644855. The cubic root of 23809921 is about 287.6863910427.

The spelling of 23809921 in words is "twenty-three million, eight hundred nine thousand, nine hundred twenty-one".