24987 has 4 divisors (see below), whose sum is σ = 33320. Its totient is φ = 16656.

The previous prime is 24979. The next prime is 24989. The reversal of 24987 is 78942.

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

It is not a de Polignac number, because 24987 - 2³ = 24979 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (24989) 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, 4162 + ... + 4167.

It is an arithmetic number, because the mean of its divisors is an integer number (8330).

2²⁴⁹⁸⁷ is an apocalyptic number.

24987 is a deficient number, since it is larger than the sum of its proper divisors (8333).

24987 is an equidigital number, since it uses as much as digits as its factorization.

24987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8332.

The product of its digits is 4032, while the sum is 30.

The square root of 24987 is about 158.0727680532. The cubic root of 24987 is about 29.2351082060.

The spelling of 24987 in words is "twenty-four thousand, nine hundred eighty-seven".