23989 has 8 divisors (see below), whose sum is σ = 28800. Its totient is φ = 19536.

The previous prime is 23981. The next prime is 23993. The reversal of 23989 is 98932.

It is a happy number.

23989 is nontrivially palindromic in base 8.

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 23989 - 2³ = 23981 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 23989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87 + ... + 235.

It is an arithmetic number, because the mean of its divisors is an integer number (3600).

2²³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

23989 is a deficient number, since it is larger than the sum of its proper divisors (4811).

23989 is a wasteful number, since it uses less digits than its factorization.

23989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179.

The product of its digits is 3888, while the sum is 31.

The square root of 23989 is about 154.8838274320. The cubic root of 23989 is about 28.8405838590.

The spelling of 23989 in words is "twenty-three thousand, nine hundred eighty-nine".