18988 has 12 divisors (see below), whose sum is σ = 34272. Its totient is φ = 9200.

The previous prime is 18979. The next prime is 19001. The reversal of 18988 is 88981.

18988 is nontrivially palindromic in base 8.

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, 138 + ... + 238.

It is an arithmetic number, because the mean of its divisors is an integer number (2856).

2¹⁸⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

18988 is a deficient number, since it is larger than the sum of its proper divisors (15284).

18988 is a wasteful number, since it uses less digits than its factorization.

18988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 150 counting only the distinct ones).

The product of its digits is 4608, while the sum is 34.

The square root of 18988 is about 137.7969520708. The cubic root of 18988 is about 26.6783976165.

The spelling of 18988 in words is "eighteen thousand, nine hundred eighty-eight".