18210109 has 8 divisors (see below), whose sum is σ = 18712512. Its totient is φ = 17710560.

The previous prime is 18210083. The next prime is 18210119. The reversal of 18210109 is 90101281.

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 18210109 - 2⁷ = 18209981 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 18210109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18210119) 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, 20182 + ... + 21064.

It is an arithmetic number, because the mean of its divisors is an integer number (2339064).

Almost surely, 2^18210109 is an apocalyptic number.

It is an amenable number.

18210109 is a deficient number, since it is larger than the sum of its proper divisors (502403).

18210109 is an equidigital number, since it uses as much as digits as its factorization.

18210109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 18210109 is about 4267.3304301401. The cubic root of 18210109 is about 263.0899035794.

The spelling of 18210109 in words is "eighteen million, two hundred ten thousand, one hundred nine".