18008539 has 2 divisors, whose sum is σ = 18008540. Its totient is φ = 18008538.

The previous prime is 18008533. The next prime is 18008579. The reversal of 18008539 is 93580081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18008539 - 2⁹ = 18008027 is a prime.

It is not a weakly prime, because it can be changed into another prime (18008533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004269 + 9004270.

It is an arithmetic number, because the mean of its divisors is an integer number (9004270).

Almost surely, 2^18008539 is an apocalyptic number.

18008539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18008539 is an equidigital number, since it uses as much as digits as its factorization.

18008539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18008539 is about 4243.6468986003. The cubic root of 18008539 is about 262.1155745561.

The spelling of 18008539 in words is "eighteen million, eight thousand, five hundred thirty-nine".