12216444 has 24 divisors (see below), whose sum is σ = 28562688. Its totient is φ = 4063920.

The previous prime is 12216439. The next prime is 12216493. The reversal of 12216444 is 44461221.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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, 9309 + ... + 10539.

It is an arithmetic number, because the mean of its divisors is an integer number (1190112).

Almost surely, 2^12216444 is an apocalyptic number.

It is an amenable number.

12216444 is an abundant number, since it is smaller than the sum of its proper divisors (16346244).

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

12216444 is a wasteful number, since it uses less digits than its factorization.

12216444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065 (or 2063 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 12216444 is about 3495.2029983965. The cubic root of 12216444 is about 230.3111353138.

Adding to 12216444 its reverse (44461221), we get a palindrome (56677665).

The spelling of 12216444 in words is "twelve million, two hundred sixteen thousand, four hundred forty-four".