18930089 has 2 divisors, whose sum is σ = 18930090. Its totient is φ = 18930088.

The previous prime is 18930083. The next prime is 18930101. The reversal of 18930089 is 98003981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17572864 + 1357225 = 4192^2 + 1165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18930089 is a prime.

It is not a weakly prime, because it can be changed into another prime (18930083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9465044 + 9465045.

It is an arithmetic number, because the mean of its divisors is an integer number (9465045).

Almost surely, 2^18930089 is an apocalyptic number.

It is an amenable number.

18930089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18930089 is an equidigital number, since it uses as much as digits as its factorization.

18930089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 18930089 is about 4350.8722114077. The cubic root of 18930089 is about 266.5124808327.

The spelling of 18930089 in words is "eighteen million, nine hundred thirty thousand, eighty-nine".