18168923 has 2 divisors, whose sum is σ = 18168924. Its totient is φ = 18168922.

The previous prime is 18168901. The next prime is 18168929. The reversal of 18168923 is 32986181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18168923 - 2¹⁰ = 18167899 is a prime.

It is not a weakly prime, because it can be changed into another prime (18168929) 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, 9084461 + 9084462.

It is an arithmetic number, because the mean of its divisors is an integer number (9084462).

Almost surely, 2^18168923 is an apocalyptic number.

18168923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18168923 is an equidigital number, since it uses as much as digits as its factorization.

18168923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 18168923 is about 4262.5019648089. The cubic root of 18168923 is about 262.8914094342.

It can be divided in two parts, 18168 and 923, that added together give a palindrome (19091).

The spelling of 18168923 in words is "eighteen million, one hundred sixty-eight thousand, nine hundred twenty-three".