23917 has 2 divisors, whose sum is σ = 23918. Its totient is φ = 23916.

The previous prime is 23911. The next prime is 23929. The reversal of 23917 is 71932.

23917 is nontrivially palindromic in base 12.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21316 + 2601 = 146^2 + 51^2 .

It is a cyclic number.

It is not a de Polignac number, because 23917 - 2³ = 23909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11958 + 11959.

It is an arithmetic number, because the mean of its divisors is an integer number (11959).

2²³⁹¹⁷ is an apocalyptic number.

It is an amenable number.

23917 is a deficient number, since it is larger than the sum of its proper divisors (1).

23917 is an equidigital number, since it uses as much as digits as its factorization.

23917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378, while the sum is 22.

The square root of 23917 is about 154.6512204931. The cubic root of 23917 is about 28.8117011352.

It can be divided in two parts, 239 and 17, that added together give a 8-th power (256 = 2⁸).

The spelling of 23917 in words is "twenty-three thousand, nine hundred seventeen".