18109927 has 4 divisors (see below), whose sum is σ = 19756296. Its totient is φ = 16463560.

The previous prime is 18109849. The next prime is 18109937. The reversal of 18109927 is 72990181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18109927 - 2⁷ = 18109799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18109937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 823168 + ... + 823189.

It is an arithmetic number, because the mean of its divisors is an integer number (4939074).

Almost surely, 2^18109927 is an apocalyptic number.

18109927 is a deficient number, since it is larger than the sum of its proper divisors (1646369).

18109927 is a wasteful number, since it uses less digits than its factorization.

18109927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646368.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 18109927 is about 4255.5759892170. The cubic root of 18109927 is about 262.6065574948.

The spelling of 18109927 in words is "eighteen million, one hundred nine thousand, nine hundred twenty-seven".