18008687 has 2 divisors, whose sum is σ = 18008688. Its totient is φ = 18008686.

The previous prime is 18008663. The next prime is 18008689. The reversal of 18008687 is 78680081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18008687 - 2¹⁰ = 18007663 is a prime.

Together with 18008689, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18008687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18008689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004343 + 9004344.

It is an arithmetic number, because the mean of its divisors is an integer number (9004344).

Almost surely, 2^18008687 is an apocalyptic number.

18008687 is a deficient number, since it is larger than the sum of its proper divisors (1).

18008687 is an equidigital number, since it uses as much as digits as its factorization.

18008687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 18008687 is about 4243.6643363961. The cubic root of 18008687 is about 262.1162926043.

The spelling of 18008687 in words is "eighteen million, eight thousand, six hundred eighty-seven".