12216418 has 16 divisors (see below), whose sum is σ = 19109376. Its totient is φ = 5850720.

The previous prime is 12216403. The next prime is 12216419. The reversal of 12216418 is 81461221.

It is a junction number, because it is equal to n+sod(n) for n = 12216392 and 12216401.

It is not an unprimeable number, because it can be changed into a prime (12216419) 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 7 ways as a sum of consecutive naturals, for example, 5430 + ... + 7342.

It is an arithmetic number, because the mean of its divisors is an integer number (1194336).

Almost surely, 2^12216418 is an apocalyptic number.

12216418 is a deficient number, since it is larger than the sum of its proper divisors (6892958).

12216418 is a wasteful number, since it uses less digits than its factorization.

12216418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049.

The product of its digits is 768, while the sum is 25.

The square root of 12216418 is about 3495.1992790111. The cubic root of 12216418 is about 230.3109719249.

Adding to 12216418 its reverse (81461221), we get a palindrome (93677639).

The spelling of 12216418 in words is "twelve million, two hundred sixteen thousand, four hundred eighteen".