12215766 has 16 divisors (see below), whose sum is σ = 24473088. Its totient is φ = 4065000.

The previous prime is 12215761. The next prime is 12215779. The reversal of 12215766 is 66751221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3151 + ... + 5861.

It is an arithmetic number, because the mean of its divisors is an integer number (1529568).

Almost surely, 2^12215766 is an apocalyptic number.

12215766 is an abundant number, since it is smaller than the sum of its proper divisors (12257322).

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

12215766 is a wasteful number, since it uses less digits than its factorization.

12215766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467.

The product of its digits is 5040, while the sum is 30.

The square root of 12215766 is about 3495.1060069760. The cubic root of 12215766 is about 230.3068745584.

Adding to 12215766 its reverse (66751221), we get a palindrome (78966987).

The spelling of 12215766 in words is "twelve million, two hundred fifteen thousand, seven hundred sixty-six".