18986 has 8 divisors (see below), whose sum is σ = 31104. Its totient is φ = 8620.

The previous prime is 18979. The next prime is 19001. The reversal of 18986 is 68981.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 410 + ... + 453.

It is an arithmetic number, because the mean of its divisors is an integer number (3888).

2¹⁸⁹⁸⁶ is an apocalyptic number.

18986 is a deficient number, since it is larger than the sum of its proper divisors (12118).

18986 is a wasteful number, since it uses less digits than its factorization.

18986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its digits is 3456, while the sum is 32.

The square root of 18986 is about 137.7896948251. The cubic root of 18986 is about 26.6774609079.

The spelling of 18986 in words is "eighteen thousand, nine hundred eighty-six".