18665039 has 2 divisors, whose sum is σ = 18665040. Its totient is φ = 18665038.

The previous prime is 18665033. The next prime is 18665071. The reversal of 18665039 is 93056681.

It is a weak prime.

It is an emirp because it is prime and its reverse (93056681) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18665039 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18664993 and 18665011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18665033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9332519 + 9332520.

It is an arithmetic number, because the mean of its divisors is an integer number (9332520).

Almost surely, 2^18665039 is an apocalyptic number.

18665039 is a deficient number, since it is larger than the sum of its proper divisors (1).

18665039 is an equidigital number, since it uses as much as digits as its factorization.

18665039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 18665039 is about 4320.3054290177. The cubic root of 18665039 is about 265.2627700895.

The spelling of 18665039 in words is "eighteen million, six hundred sixty-five thousand, thirty-nine".