18045609 has 4 divisors (see below), whose sum is σ = 24060816. Its totient is φ = 12030404.

The previous prime is 18045607. The next prime is 18045623. The reversal of 18045609 is 90654081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18045609 - 2¹ = 18045607 is a prime.

It is a super-3 number, since 3×18045609³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18045609.

It is not an unprimeable number, because it can be changed into a prime (18045607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3007599 + ... + 3007604.

It is an arithmetic number, because the mean of its divisors is an integer number (6015204).

Almost surely, 2^18045609 is an apocalyptic number.

It is an amenable number.

18045609 is a deficient number, since it is larger than the sum of its proper divisors (6015207).

18045609 is an equidigital number, since it uses as much as digits as its factorization.

18045609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6015206.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 18045609 is about 4248.0123587391. The cubic root of 18045609 is about 262.2953034584.

The spelling of 18045609 in words is "eighteen million, forty-five thousand, six hundred nine".