18245987 has 2 divisors, whose sum is σ = 18245988. Its totient is φ = 18245986.

The previous prime is 18245957. The next prime is 18245993. The reversal of 18245987 is 78954281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18245987 - 2²² = 14051683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18245957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9122993 + 9122994.

It is an arithmetic number, because the mean of its divisors is an integer number (9122994).

Almost surely, 2^18245987 is an apocalyptic number.

18245987 is a deficient number, since it is larger than the sum of its proper divisors (1).

18245987 is an equidigital number, since it uses as much as digits as its factorization.

18245987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 18245987 is about 4271.5321607124. The cubic root of 18245987 is about 263.2625722743.

The spelling of 18245987 in words is "eighteen million, two hundred forty-five thousand, nine hundred eighty-seven".