18089602 has 4 divisors (see below), whose sum is σ = 27134406. Its totient is φ = 9044800.

The previous prime is 18089597. The next prime is 18089623. The reversal of 18089602 is 20698081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12467961 + 5621641 = 3531^2 + 2371^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4522399 + ... + 4522402.

Almost surely, 2^18089602 is an apocalyptic number.

18089602 is a deficient number, since it is larger than the sum of its proper divisors (9044804).

18089602 is an equidigital number, since it uses as much as digits as its factorization.

18089602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9044803.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 18089602 is about 4253.1872754441. The cubic root of 18089602 is about 262.5082784993.

It can be divided in two parts, 180 and 89602, that multiplied together give a triangular number (16128360 = T₅₆₇₉).

The spelling of 18089602 in words is "eighteen million, eighty-nine thousand, six hundred two".