18188 has 6 divisors (see below), whose sum is σ = 31836. Its totient is φ = 9092.

The previous prime is 18181. The next prime is 18191. The reversal of 18188 is 88181.

It is not an unprimeable number, because it can be changed into a prime (18181) by changing a digit.

18188 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2270 + ... + 2277.

It is an arithmetic number, because the mean of its divisors is an integer number (5306).

2¹⁸¹⁸⁸ is an apocalyptic number.

It is an amenable number.

18188 is a deficient number, since it is larger than the sum of its proper divisors (13648).

18188 is a wasteful number, since it uses less digits than its factorization.

18188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4551 (or 4549 counting only the distinct ones).

The product of its digits is 512, while the sum is 26.

The square root of 18188 is about 134.8628933399. The cubic root of 18188 is about 26.2983387463.

The spelling of 18188 in words is "eighteen thousand, one hundred eighty-eight".