18525887 has 2 divisors, whose sum is σ = 18525888. Its totient is φ = 18525886.

The previous prime is 18525853. The next prime is 18525907. The reversal of 18525887 is 78852581.

It is a strong prime.

It is an emirp because it is prime and its reverse (78852581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18525887 - 2²⁰ = 17477311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18525827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9262943 + 9262944.

It is an arithmetic number, because the mean of its divisors is an integer number (9262944).

Almost surely, 2^18525887 is an apocalyptic number.

18525887 is a deficient number, since it is larger than the sum of its proper divisors (1).

18525887 is an equidigital number, since it uses as much as digits as its factorization.

18525887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 179200, while the sum is 44.

The square root of 18525887 is about 4304.1708841541. The cubic root of 18525887 is about 264.6019275474.

The spelling of 18525887 in words is "eighteen million, five hundred twenty-five thousand, eight hundred eighty-seven".