18109912 has 8 divisors (see below), whose sum is σ = 33956100. Its totient is φ = 9054952.

The previous prime is 18109849. The next prime is 18109937. The reversal of 18109912 is 21990181.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1131862 + ... + 1131877.

Almost surely, 2^18109912 is an apocalyptic number.

It is an amenable number.

18109912 is a deficient number, since it is larger than the sum of its proper divisors (15846188).

18109912 is a wasteful number, since it uses less digits than its factorization.

18109912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263745 (or 2263741 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 18109912 is about 4255.5742268230. The cubic root of 18109912 is about 262.6064849913.

The spelling of 18109912 in words is "eighteen million, one hundred nine thousand, nine hundred twelve".