18366899 has 2 divisors, whose sum is σ = 18366900. Its totient is φ = 18366898.

The previous prime is 18366869. The next prime is 18366913. The reversal of 18366899 is 99866381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18366899 - 2²⁴ = 1589683 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18366809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183449 + 9183450.

It is an arithmetic number, because the mean of its divisors is an integer number (9183450).

Almost surely, 2^18366899 is an apocalyptic number.

18366899 is a deficient number, since it is larger than the sum of its proper divisors (1).

18366899 is an equidigital number, since it uses as much as digits as its factorization.

18366899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 50.

The square root of 18366899 is about 4285.6620258718. The cubic root of 18366899 is about 263.8428194681.

The spelling of 18366899 in words is "eighteen million, three hundred sixty-six thousand, eight hundred ninety-nine".