18989023 has 2 divisors, whose sum is σ = 18989024. Its totient is φ = 18989022.

The previous prime is 18988967. The next prime is 18989039. The reversal of 18989023 is 32098981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18989023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18989923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9494511 + 9494512.

It is an arithmetic number, because the mean of its divisors is an integer number (9494512).

Almost surely, 2^18989023 is an apocalyptic number.

18989023 is a deficient number, since it is larger than the sum of its proper divisors (1).

18989023 is an equidigital number, since it uses as much as digits as its factorization.

18989023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 18989023 is about 4357.6396133687. The cubic root of 18989023 is about 266.7887671747.

The spelling of 18989023 in words is "eighteen million, nine hundred eighty-nine thousand, twenty-three".