18556109 has 8 divisors (see below), whose sum is σ = 21800352. Its totient is φ = 15571440.

The previous prime is 18556093. The next prime is 18556133. The reversal of 18556109 is 90165581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18556109 - 2⁴ = 18556093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18556169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64739 + ... + 65024.

It is an arithmetic number, because the mean of its divisors is an integer number (2725044).

Almost surely, 2^18556109 is an apocalyptic number.

It is an amenable number.

18556109 is a deficient number, since it is larger than the sum of its proper divisors (3244243).

18556109 is a wasteful number, since it uses less digits than its factorization.

18556109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129787.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 18556109 is about 4307.6802341864. The cubic root of 18556109 is about 264.7457345150.

The spelling of 18556109 in words is "eighteen million, five hundred fifty-six thousand, one hundred nine".