18386923 has 2 divisors, whose sum is σ = 18386924. Its totient is φ = 18386922.

The previous prime is 18386909. The next prime is 18386947. The reversal of 18386923 is 32968381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18386923 - 2²¹ = 16289771 is a prime.

It is not a weakly prime, because it can be changed into another prime (18386993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9193461 + 9193462.

It is an arithmetic number, because the mean of its divisors is an integer number (9193462).

Almost surely, 2^18386923 is an apocalyptic number.

18386923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18386923 is an equidigital number, since it uses as much as digits as its factorization.

18386923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 18386923 is about 4287.9975513053. The cubic root of 18386923 is about 263.9386670729.

The spelling of 18386923 in words is "eighteen million, three hundred eighty-six thousand, nine hundred twenty-three".