18055609 has 16 divisors (see below), whose sum is σ = 21901824. Its totient is φ = 14659200.

The previous prime is 18055607. The next prime is 18055619. The reversal of 18055609 is 90655081.

It is a cyclic number.

It is not a de Polignac number, because 18055609 - 2¹ = 18055607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18055607) 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, 2397 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (1368864).

Almost surely, 2^18055609 is an apocalyptic number.

It is an amenable number.

18055609 is a deficient number, since it is larger than the sum of its proper divisors (3846215).

18055609 is a wasteful number, since it uses less digits than its factorization.

18055609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 18055609 is about 4249.1892167801. The cubic root of 18055609 is about 262.3437449506.

The spelling of 18055609 in words is "eighteen million, fifty-five thousand, six hundred nine".