18289589 has 6 divisors (see below), whose sum is σ = 18505410. Its totient is φ = 18076256.

The previous prime is 18289561. The next prime is 18289591. The reversal of 18289589 is 98598281.

It can be written as a sum of positive squares in 3 ways, for example, as 1067089 + 17222500 = 1033^2 + 4150^2 .

It is not a de Polignac number, because 18289589 - 2¹⁶ = 18224053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18289549) 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 in 5 ways as a sum of consecutive naturals, for example, 6767 + ... + 9075.

It is an arithmetic number, because the mean of its divisors is an integer number (3084235).

Almost surely, 2^18289589 is an apocalyptic number.

It is an amenable number.

18289589 is a deficient number, since it is larger than the sum of its proper divisors (215821).

18289589 is an frugal number, since it uses more digits than its factorization.

18289589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487 (or 2398 counting only the distinct ones).

The product of its digits is 414720, while the sum is 50.

The square root of 18289589 is about 4276.6329045173. The cubic root of 18289589 is about 263.4721095510.

The spelling of 18289589 in words is "eighteen million, two hundred eighty-nine thousand, five hundred eighty-nine".