18624 has 28 divisors (see below), whose sum is σ = 49784. Its totient is φ = 6144.

The previous prime is 18617. The next prime is 18637. The reversal of 18624 is 42681.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is one of the 548 Lynch-Bell numbers.

It is a nialpdrome in base 8 and base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 18624.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144 + ... + 240.

It is an arithmetic number, because the mean of its divisors is an integer number (1778).

2¹⁸⁶²⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24892).

18624 is an abundant number, since it is smaller than the sum of its proper divisors (31160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18624 is an equidigital number, since it uses as much as digits as its factorization.

18624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 102 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 18624 is about 136.4697768739. The cubic root of 18624 is about 26.5068215499.

It can be divided in two parts, 186 and 24, that added together give a triangular number (210 = T₂₀).

The spelling of 18624 in words is "eighteen thousand, six hundred twenty-four".