18996587 has 2 divisors, whose sum is σ = 18996588. Its totient is φ = 18996586.

The previous prime is 18996563. The next prime is 18996589. The reversal of 18996587 is 78569981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18996587 - 2⁸ = 18996331 is a prime.

Together with 18996589, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18996589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9498293 + 9498294.

It is an arithmetic number, because the mean of its divisors is an integer number (9498294).

Almost surely, 2^18996587 is an apocalyptic number.

18996587 is a deficient number, since it is larger than the sum of its proper divisors (1).

18996587 is an equidigital number, since it uses as much as digits as its factorization.

18996587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 53.

The square root of 18996587 is about 4358.5074280079. The cubic root of 18996587 is about 266.8241862754.

The spelling of 18996587 in words is "eighteen million, nine hundred ninety-six thousand, five hundred eighty-seven".