23979 has 4 divisors (see below), whose sum is σ = 31976. Its totient is φ = 15984.

The previous prime is 23977. The next prime is 23981. The reversal of 23979 is 97932.

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

It is an interprime number because it is at equal distance from previous prime (23977) and next prime (23981).

It is not a de Polignac number, because 23979 - 2¹ = 23977 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23971) 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, 3994 + ... + 3999.

It is an arithmetic number, because the mean of its divisors is an integer number (7994).

2²³⁹⁷⁹ is an apocalyptic number.

23979 is a deficient number, since it is larger than the sum of its proper divisors (7997).

23979 is an equidigital number, since it uses as much as digits as its factorization.

23979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7996.

The product of its digits is 3402, while the sum is 30.

The square root of 23979 is about 154.8515418070. The cubic root of 23979 is about 28.8365758286.

It can be divided in two parts, 239 and 79, that multiplied together give a palindrome (18881).

The spelling of 23979 in words is "twenty-three thousand, nine hundred seventy-nine".