18478589 has 2 divisors, whose sum is σ = 18478590. Its totient is φ = 18478588.

The previous prime is 18478571. The next prime is 18478619. The reversal of 18478589 is 98587481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14707225 + 3771364 = 3835^2 + 1942^2 .

It is a cyclic number.

It is not a de Polignac number, because 18478589 - 2²⁰ = 17430013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18478529) 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, 9239294 + 9239295.

It is an arithmetic number, because the mean of its divisors is an integer number (9239295).

Almost surely, 2^18478589 is an apocalyptic number.

It is an amenable number.

18478589 is a deficient number, since it is larger than the sum of its proper divisors (1).

18478589 is an equidigital number, since it uses as much as digits as its factorization.

18478589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 50.

The square root of 18478589 is about 4298.6729347556. The cubic root of 18478589 is about 264.3765526831.

The spelling of 18478589 in words is "eighteen million, four hundred seventy-eight thousand, five hundred eighty-nine".