18589489 has 2 divisors, whose sum is σ = 18589490. Its totient is φ = 18589488.

The previous prime is 18589481. The next prime is 18589507. The reversal of 18589489 is 98498581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18558864 + 30625 = 4308^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 18589489 - 2³ = 18589481 is a prime.

It is a super-2 number, since 2×18589489² = 691138202562242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18589481) 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, 9294744 + 9294745.

It is an arithmetic number, because the mean of its divisors is an integer number (9294745).

Almost surely, 2^18589489 is an apocalyptic number.

It is an amenable number.

18589489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18589489 is an equidigital number, since it uses as much as digits as its factorization.

18589489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 52.

The square root of 18589489 is about 4311.5529684790. The cubic root of 18589489 is about 264.9043870089.

The spelling of 18589489 in words is "eighteen million, five hundred eighty-nine thousand, four hundred eighty-nine".