12115556 has 12 divisors (see below), whose sum is σ = 21412860. Its totient is φ = 5997600.

The previous prime is 12115553. The next prime is 12115561. The reversal of 12115556 is 65551121.

It can be written as a sum of positive squares in 2 ways, for example, as 11115556 + 1000000 = 3334^2 + 1000^2 .

It is not an unprimeable number, because it can be changed into a prime (12115553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14591 + ... + 15398.

It is an arithmetic number, because the mean of its divisors is an integer number (1784405).

Almost surely, 2^12115556 is an apocalyptic number.

It is an amenable number.

12115556 is a deficient number, since it is larger than the sum of its proper divisors (9297304).

12115556 is a wasteful number, since it uses less digits than its factorization.

12115556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30094 (or 30092 counting only the distinct ones).

The product of its digits is 1500, while the sum is 26.

The square root of 12115556 is about 3480.7407257651. The cubic root of 12115556 is about 229.6753832688.

Adding to 12115556 its reverse (65551121), we get a palindrome (77666677).

The spelling of 12115556 in words is "twelve million, one hundred fifteen thousand, five hundred fifty-six".