12218624 has 36 divisors (see below), whose sum is σ = 26612880. Its totient is φ = 5552640.

The previous prime is 12218623. The next prime is 12218627. The reversal of 12218624 is 42681221.

It is a happy number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 12218593 and 12218602.

It is not an unprimeable number, because it can be changed into a prime (12218623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647 + ... + 4985.

Almost surely, 2^12218624 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 12218624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13306440).

12218624 is an abundant number, since it is smaller than the sum of its proper divisors (14394256).

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

12218624 is an equidigital number, since it uses as much as digits as its factorization.

12218624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366 (or 4352 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 12218624 is about 3495.5148404777. The cubic root of 12218624 is about 230.3248340195.

Adding to 12218624 its reverse (42681221), we get a palindrome (54899845).

The spelling of 12218624 in words is "twelve million, two hundred eighteen thousand, six hundred twenty-four".