18036609 has 16 divisors (see below), whose sum is σ = 25583040. Its totient is φ = 11264000.

The previous prime is 18036607. The next prime is 18036653. The reversal of 18036609 is 90663081.

It is a cyclic number.

It is not a de Polignac number, because 18036609 - 2¹ = 18036607 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18036609.

It is not an unprimeable number, because it can be changed into a prime (18036607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12097 + ... + 13505.

It is an arithmetic number, because the mean of its divisors is an integer number (1598940).

Almost surely, 2^18036609 is an apocalyptic number.

It is an amenable number.

18036609 is a deficient number, since it is larger than the sum of its proper divisors (7546431).

18036609 is a wasteful number, since it uses less digits than its factorization.

18036609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 18036609 is about 4246.9529076739. The cubic root of 18036609 is about 262.2516908121.

The spelling of 18036609 in words is "eighteen million, thirty-six thousand, six hundred nine".