23978923 has 4 divisors (see below), whose sum is σ = 24627040. Its totient is φ = 23330808.

The previous prime is 23978921. The next prime is 23978953. The reversal of 23978923 is 32987932.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 23978923 - 2¹ = 23978921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23978923.

It is not an unprimeable number, because it can be changed into a prime (23978921) 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, 324003 + ... + 324076.

It is an arithmetic number, because the mean of its divisors is an integer number (6156760).

Almost surely, 2^23978923 is an apocalyptic number.

23978923 is a deficient number, since it is larger than the sum of its proper divisors (648117).

23978923 is an equidigital number, since it uses as much as digits as its factorization.

23978923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648116.

The product of its digits is 163296, while the sum is 43.

The square root of 23978923 is about 4896.8278507622. The cubic root of 23978923 is about 288.3654496248.

Subtracting 23978923 from its reverse (32987932), we obtain a palindrome (9009009).

The spelling of 23978923 in words is "twenty-three million, nine hundred seventy-eight thousand, nine hundred twenty-three".