12218544 has 120 divisors (see below), whose sum is σ = 37778832. Its totient is φ = 3663360.

The previous prime is 12218537. The next prime is 12218587. The reversal of 12218544 is 44581221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114139 + ... + 114245.

Almost surely, 2^12218544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12218544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18889416).

12218544 is an abundant number, since it is smaller than the sum of its proper divisors (25560288).

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

12218544 is a wasteful number, since it uses less digits than its factorization.

12218544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 186 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 12218544 is about 3495.5033972234. The cubic root of 12218544 is about 230.3243313435.

Adding to 12218544 its reverse (44581221), we get a palindrome (56799765).

The spelling of 12218544 in words is "twelve million, two hundred eighteen thousand, five hundred forty-four".