18109173 has 8 divisors (see below), whose sum is σ = 24176608. Its totient is φ = 12057264.

The previous prime is 18109171. The next prime is 18109187. The reversal of 18109173 is 37190181.

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

It is not a de Polignac number, because 18109173 - 2¹ = 18109171 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18109173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109171) 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, 811 + ... + 6072.

It is an arithmetic number, because the mean of its divisors is an integer number (3022076).

Almost surely, 2^18109173 is an apocalyptic number.

It is an amenable number.

18109173 is a deficient number, since it is larger than the sum of its proper divisors (6067435).

18109173 is an equidigital number, since it uses as much as digits as its factorization.

18109173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7763.

The product of its (nonzero) digits is 1512, while the sum is 30.

The square root of 18109173 is about 4255.4873986419. The cubic root of 18109173 is about 262.6029129358.

The spelling of 18109173 in words is "eighteen million, one hundred nine thousand, one hundred seventy-three".