18889589 has 2 divisors, whose sum is σ = 18889590. Its totient is φ = 18889588.

The previous prime is 18889583. The next prime is 18889603. The reversal of 18889589 is 98598881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12040900 + 6848689 = 3470^2 + 2617^2 .

It is a cyclic number.

It is not a de Polignac number, because 18889589 - 2²⁰ = 17841013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18889583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9444794 + 9444795.

It is an arithmetic number, because the mean of its divisors is an integer number (9444795).

Almost surely, 2^18889589 is an apocalyptic number.

It is an amenable number.

18889589 is a deficient number, since it is larger than the sum of its proper divisors (1).

18889589 is an equidigital number, since it uses as much as digits as its factorization.

18889589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 56.

The square root of 18889589 is about 4346.2154801620. The cubic root of 18889589 is about 266.3222816528.

The spelling of 18889589 in words is "eighteen million, eight hundred eighty-nine thousand, five hundred eighty-nine".