18016139 has 2 divisors, whose sum is σ = 18016140. Its totient is φ = 18016138.

The previous prime is 18016133. The next prime is 18016147. The reversal of 18016139 is 93161081.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18016139 - 2⁸ = 18015883 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18016133) 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, 9008069 + 9008070.

It is an arithmetic number, because the mean of its divisors is an integer number (9008070).

Almost surely, 2^18016139 is an apocalyptic number.

18016139 is a deficient number, since it is larger than the sum of its proper divisors (1).

18016139 is an equidigital number, since it uses as much as digits as its factorization.

18016139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 18016139 is about 4244.5422603621. The cubic root of 18016139 is about 262.1524422183.

The spelling of 18016139 in words is "eighteen million, sixteen thousand, one hundred thirty-nine".