23987 has 6 divisors (see below), whose sum is σ = 25788. Its totient is φ = 22304.

The previous prime is 23981. The next prime is 23993. The reversal of 23987 is 78932.

It is an interprime number because it is at equal distance from previous prime (23981) and next prime (23993).

It is not a de Polignac number, because 23987 - 2⁴ = 23971 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 23987.

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 5 ways as a sum of consecutive naturals, for example, 248 + ... + 330.

It is an arithmetic number, because the mean of its divisors is an integer number (4298).

2²³⁹⁸⁷ is an apocalyptic number.

23987 is a deficient number, since it is larger than the sum of its proper divisors (1801).

23987 is an equidigital number, since it uses as much as digits as its factorization.

23987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 100 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 23987 is about 154.8773708455. The cubic root of 23987 is about 28.8397823421.

Subtracting 23987 from its reverse (78932), we obtain a palindrome (54945).

The spelling of 23987 in words is "twenty-three thousand, nine hundred eighty-seven".