18809109 has 24 divisors (see below), whose sum is σ = 29782272. Its totient is φ = 11344320.

The previous prime is 18809099. The next prime is 18809113. The reversal of 18809109 is 90190881.

It is not a de Polignac number, because 18809109 - 2⁴ = 18809093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18809159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30684 + ... + 31290.

It is an arithmetic number, because the mean of its divisors is an integer number (1240928).

Almost surely, 2^18809109 is an apocalyptic number.

It is an amenable number.

18809109 is a deficient number, since it is larger than the sum of its proper divisors (10973163).

18809109 is a wasteful number, since it uses less digits than its factorization.

18809109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937 (or 934 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 18809109 is about 4336.9469676260. The cubic root of 18809109 is about 265.9435169422.

The spelling of 18809109 in words is "eighteen million, eight hundred nine thousand, one hundred nine".