18575987 has 2 divisors, whose sum is σ = 18575988. Its totient is φ = 18575986.

The previous prime is 18575971. The next prime is 18576001. The reversal of 18575987 is 78957581.

It is a strong prime.

It is an emirp because it is prime and its reverse (78957581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18575987 - 2⁴ = 18575971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18575587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9287993 + 9287994.

It is an arithmetic number, because the mean of its divisors is an integer number (9287994).

Almost surely, 2^18575987 is an apocalyptic number.

18575987 is a deficient number, since it is larger than the sum of its proper divisors (1).

18575987 is an equidigital number, since it uses as much as digits as its factorization.

18575987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 50.

The square root of 18575987 is about 4309.9868909313. The cubic root of 18575987 is about 264.8402359656.

The spelling of 18575987 in words is "eighteen million, five hundred seventy-five thousand, nine hundred eighty-seven".