12218412 has 12 divisors (see below), whose sum is σ = 28509656. Its totient is φ = 4072800.

The previous prime is 12218363. The next prime is 12218417. The reversal of 12218412 is 21481221.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (12218417) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 509089 + ... + 509112.

Almost surely, 2^12218412 is an apocalyptic number.

12218412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12218412 is an abundant number, since it is smaller than the sum of its proper divisors (16291244).

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

12218412 is a wasteful number, since it uses less digits than its factorization.

12218412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018208 (or 1018206 counting only the distinct ones).

The product of its digits is 256, while the sum is 21.

The square root of 12218412 is about 3495.4845157717. The cubic root of 12218412 is about 230.3235019233.

Adding to 12218412 its reverse (21481221), we get a palindrome (33699633).

The spelling of 12218412 in words is "twelve million, two hundred eighteen thousand, four hundred twelve".