18287 has 2 divisors, whose sum is σ = 18288. Its totient is φ = 18286.

The previous prime is 18269. The next prime is 18289. The reversal of 18287 is 78281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18287 - 2⁶ = 18223 is a prime.

Together with 18289, it forms a pair of twin primes.

It is a Chen prime.

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 18287.

It is not a weakly prime, because it can be changed into another prime (18289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9143 + 9144.

It is an arithmetic number, because the mean of its divisors is an integer number (9144).

2¹⁸²⁸⁷ is an apocalyptic number.

18287 is a deficient number, since it is larger than the sum of its proper divisors (1).

18287 is an equidigital number, since it uses as much as digits as its factorization.

18287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 26.

The square root of 18287 is about 135.2294346657. The cubic root of 18287 is about 26.3459676950.

Subtracting from 18287 its product of digits (896), we obtain a triangular number (17391 = T₁₈₆).

The spelling of 18287 in words is "eighteen thousand, two hundred eighty-seven".