18616 has 16 divisors (see below), whose sum is σ = 37800. Its totient is φ = 8544.

The previous prime is 18593. The next prime is 18617. The reversal of 18616 is 61681.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18617) 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, 15 + ... + 193.

2¹⁸⁶¹⁶ 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 18616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18900).

18616 is an abundant number, since it is smaller than the sum of its proper divisors (19184).

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

18616 is a wasteful number, since it uses less digits than its factorization.

18616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 194 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 18616 is about 136.4404632065. The cubic root of 18616 is about 26.5030256424.

It can be divided in two parts, 186 and 16, that added together give a palindrome (202).

The spelling of 18616 in words is "eighteen thousand, six hundred sixteen".