12115866 has 64 divisors (see below), whose sum is σ = 29859840. Its totient is φ = 3198720.

The previous prime is 12115861. The next prime is 12115867. The reversal of 12115866 is 66851121.

It is not an unprimeable number, because it can be changed into a prime (12115861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50575 + ... + 50813.

It is an arithmetic number, because the mean of its divisors is an integer number (466560).

Almost surely, 2^12115866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12115866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14929920).

12115866 is an abundant number, since it is smaller than the sum of its proper divisors (17743974).

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

12115866 is a wasteful number, since it uses less digits than its factorization.

12115866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339.

The product of its digits is 2880, while the sum is 30.

The square root of 12115866 is about 3480.7852562317. The cubic root of 12115866 is about 229.6773421488.

Adding to 12115866 its reverse (66851121), we get a palindrome (78966987).

The spelling of 12115866 in words is "twelve million, one hundred fifteen thousand, eight hundred sixty-six".