23921039 has 4 divisors (see below), whose sum is σ = 23993640. Its totient is φ = 23848440.

The previous prime is 23921017. The next prime is 23921047. The reversal of 23921039 is 93012932.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23921039 is a prime.

It is a super-2 number, since 2×23921039² = 1144432213679042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23921059) 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, 35804 + ... + 36465.

It is an arithmetic number, because the mean of its divisors is an integer number (5998410).

Almost surely, 2^23921039 is an apocalyptic number.

23921039 is a deficient number, since it is larger than the sum of its proper divisors (72601).

23921039 is an equidigital number, since it uses as much as digits as its factorization.

23921039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72600.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 23921039 is about 4890.9139227756. The cubic root of 23921039 is about 288.1332290929.

The spelling of 23921039 in words is "twenty-three million, nine hundred twenty-one thousand, thirty-nine".