18364909 has 2 divisors, whose sum is σ = 18364910. Its totient is φ = 18364908.

The previous prime is 18364903. The next prime is 18364919. The reversal of 18364909 is 90946381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16024009 + 2340900 = 4003^2 + 1530^2 .

It is an emirp because it is prime and its reverse (90946381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18364909 - 2⁷ = 18364781 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18364903) 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, 9182454 + 9182455.

It is an arithmetic number, because the mean of its divisors is an integer number (9182455).

Almost surely, 2^18364909 is an apocalyptic number.

It is an amenable number.

18364909 is a deficient number, since it is larger than the sum of its proper divisors (1).

18364909 is an equidigital number, since it uses as much as digits as its factorization.

18364909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 18364909 is about 4285.4298500851. The cubic root of 18364909 is about 263.8332902570.

The spelling of 18364909 in words is "eighteen million, three hundred sixty-four thousand, nine hundred nine".