18109115 has 8 divisors (see below), whose sum is σ = 22432128. Its totient is φ = 14019840.

The previous prime is 18109111. The next prime is 18109127. The reversal of 18109115 is 51190181.

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

It is not a de Polignac number, because 18109115 - 2² = 18109111 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18109111) 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, 58262 + ... + 58571.

It is an arithmetic number, because the mean of its divisors is an integer number (2804016).

Almost surely, 2^18109115 is an apocalyptic number.

18109115 is a deficient number, since it is larger than the sum of its proper divisors (4323013).

18109115 is a wasteful number, since it uses less digits than its factorization.

18109115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116869.

The product of its (nonzero) digits is 360, while the sum is 26.

The square root of 18109115 is about 4255.4805839059. The cubic root of 18109115 is about 262.6026325809.

Adding to 18109115 its reverse (51190181), we get a palindrome (69299296).

The spelling of 18109115 in words is "eighteen million, one hundred nine thousand, one hundred fifteen".