12216456 has 48 divisors (see below), whose sum is σ = 37814400. Its totient is φ = 3490272.

The previous prime is 12216439. The next prime is 12216493. The reversal of 12216456 is 65461221.

12216456 is a `hidden beast` number, since 12 + 2 + 1 + 645 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11616 + ... + 12623.

It is an arithmetic number, because the mean of its divisors is an integer number (787800).

Almost surely, 2^12216456 is an apocalyptic number.

It is an amenable number.

12216456 is an abundant number, since it is smaller than the sum of its proper divisors (25597944).

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

12216456 is a wasteful number, since it uses less digits than its factorization.

12216456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24258 (or 24251 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 12216456 is about 3495.2047150346. The cubic root of 12216456 is about 230.3112107240.

Adding to 12216456 its reverse (65461221), we get a palindrome (77677677).

The spelling of 12216456 in words is "twelve million, two hundred sixteen thousand, four hundred fifty-six".