18887 has 8 divisors (see below), whose sum is σ = 22032. Its totient is φ = 16000.

The previous prime is 18869. The next prime is 18899. The reversal of 18887 is 78881.

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

It is a cyclic number.

It is not a de Polignac number, because 18887 - 2¹⁰ = 17863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137 + ... + 237.

It is an arithmetic number, because the mean of its divisors is an integer number (2754).

2¹⁸⁸⁸⁷ is an apocalyptic number.

18887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18887 is a deficient number, since it is larger than the sum of its proper divisors (3145).

18887 is a wasteful number, since it uses less digits than its factorization.

18887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129.

The product of its digits is 3584, while the sum is 32.

The square root of 18887 is about 137.4299821727. The cubic root of 18887 is about 26.6310113753.

It can be divided in two parts, 1 and 8887, that added together give a palindrome (8888).

The spelling of 18887 in words is "eighteen thousand, eight hundred eighty-seven".