12105918 has 24 divisors (see below), whose sum is σ = 28614456. Its totient is φ = 3668400.

The previous prime is 12105917. The next prime is 12105923. The reversal of 12105918 is 81950121.

It is a junction number, because it is equal to n+sod(n) for n = 12105891 and 12105900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30373 + ... + 30768.

It is an arithmetic number, because the mean of its divisors is an integer number (1192269).

Almost surely, 2^12105918 is an apocalyptic number.

12105918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12105918 is an abundant number, since it is smaller than the sum of its proper divisors (16508538).

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

12105918 is a wasteful number, since it uses less digits than its factorization.

12105918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61160 (or 61157 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 12105918 is about 3479.3559748896. The cubic root of 12105918 is about 229.6144643811.

The spelling of 12105918 in words is "twelve million, one hundred five thousand, nine hundred eighteen".