18365969 has 2 divisors, whose sum is σ = 18365970. Its totient is φ = 18365968.

The previous prime is 18365953. The next prime is 18365993. The reversal of 18365969 is 96956381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13786369 + 4579600 = 3713^2 + 2140^2 .

It is an emirp because it is prime and its reverse (96956381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18365969 - 2⁴ = 18365953 is a prime.

It is a super-2 number, since 2×18365969² = 674617634617922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18365929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9182984 + 9182985.

It is an arithmetic number, because the mean of its divisors is an integer number (9182985).

Almost surely, 2^18365969 is an apocalyptic number.

It is an amenable number.

18365969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18365969 is an equidigital number, since it uses as much as digits as its factorization.

18365969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 47.

The square root of 18365969 is about 4285.5535231753. The cubic root of 18365969 is about 263.8383662039.

The spelling of 18365969 in words is "eighteen million, three hundred sixty-five thousand, nine hundred sixty-nine".