12111918 has 48 divisors (see below), whose sum is σ = 30355920. Its totient is φ = 3193344.

The previous prime is 12111907. The next prime is 12111923. The reversal of 12111918 is 81911121.

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 in 23 ways as a sum of consecutive naturals, for example, 2238 + ... + 5406.

It is an arithmetic number, because the mean of its divisors is an integer number (632415).

Almost surely, 2^12111918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12111918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15177960).

12111918 is an abundant number, since it is smaller than the sum of its proper divisors (18244002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12111918 is a wasteful number, since it uses less digits than its factorization.

12111918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3201 (or 3194 counting only the distinct ones).

The product of its digits is 144, while the sum is 24.

The square root of 12111918 is about 3480.2180966141. The cubic root of 12111918 is about 229.6523923665.

The spelling of 12111918 in words is "twelve million, one hundred eleven thousand, nine hundred eighteen".