18336209 has 2 divisors, whose sum is σ = 18336210. Its totient is φ = 18336208.

The previous prime is 18336203. The next prime is 18336257. The reversal of 18336209 is 90263381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15429184 + 2907025 = 3928^2 + 1705^2 .

It is a cyclic number.

It is not a de Polignac number, because 18336209 - 2⁴ = 18336193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18336203) 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, 9168104 + 9168105.

It is an arithmetic number, because the mean of its divisors is an integer number (9168105).

Almost surely, 2^18336209 is an apocalyptic number.

It is an amenable number.

18336209 is a deficient number, since it is larger than the sum of its proper divisors (1).

18336209 is an equidigital number, since it uses as much as digits as its factorization.

18336209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 18336209 is about 4282.0799852408. The cubic root of 18336209 is about 263.6957823013.

The spelling of 18336209 in words is "eighteen million, three hundred thirty-six thousand, two hundred nine".