18087 has 4 divisors (see below), whose sum is σ = 24120. Its totient is φ = 12056.

The previous prime is 18077. The next prime is 18089. The reversal of 18087 is 78081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18087 - 2⁷ = 17959 is a prime.

It is a D-number.

18087 is a lucky number.

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 18087.

It is not an unprimeable number, because it can be changed into a prime (18089) 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, 3012 + ... + 3017.

It is an arithmetic number, because the mean of its divisors is an integer number (6030).

2¹⁸⁰⁸⁷ is an apocalyptic number.

18087 is a deficient number, since it is larger than the sum of its proper divisors (6033).

18087 is an equidigital number, since it uses as much as digits as its factorization.

18087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6032.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 18087 is about 134.4879176729. The cubic root of 18087 is about 26.2495691539.

The spelling of 18087 in words is "eighteen thousand, eighty-seven".