18587087 has 2 divisors, whose sum is σ = 18587088. Its totient is φ = 18587086.

The previous prime is 18587083. The next prime is 18587117. The reversal of 18587087 is 78078581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18587087 - 2² = 18587083 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18587081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9293543 + 9293544.

It is an arithmetic number, because the mean of its divisors is an integer number (9293544).

Almost surely, 2^18587087 is an apocalyptic number.

18587087 is a deficient number, since it is larger than the sum of its proper divisors (1).

18587087 is an equidigital number, since it uses as much as digits as its factorization.

18587087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125440, while the sum is 44.

The square root of 18587087 is about 4311.2744055557. The cubic root of 18587087 is about 264.8929768379.

The spelling of 18587087 in words is "eighteen million, five hundred eighty-seven thousand, eighty-seven".