12218766 has 16 divisors (see below), whose sum is σ = 27928704. Its totient is φ = 3491064.

The previous prime is 12218761. The next prime is 12218777. The reversal of 12218766 is 66781221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12218761) 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 7 ways as a sum of consecutive naturals, for example, 145420 + ... + 145503.

It is an arithmetic number, because the mean of its divisors is an integer number (1745544).

Almost surely, 2^12218766 is an apocalyptic number.

12218766 is an abundant number, since it is smaller than the sum of its proper divisors (15709938).

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

12218766 is a wasteful number, since it uses less digits than its factorization.

12218766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290935.

The product of its digits is 8064, while the sum is 33.

The square root of 12218766 is about 3495.5351521620. The cubic root of 12218766 is about 230.3257262640.

Adding to 12218766 its reverse (66781221), we get a palindrome (78999987).

The spelling of 12218766 in words is "twelve million, two hundred eighteen thousand, seven hundred sixty-six".