12219312 has 80 divisors (see below), whose sum is σ = 36997632. Its totient is φ = 3402240.

The previous prime is 12219307. The next prime is 12219323. The reversal of 12219312 is 21391221.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 15 ways as a sum of consecutive naturals, for example, 13333 + ... + 14219.

Almost surely, 2^12219312 is an apocalyptic number.

12219312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12219312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18498816).

12219312 is an abundant number, since it is smaller than the sum of its proper divisors (24778320).

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

12219312 is a wasteful number, since it uses less digits than its factorization.

12219312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946 (or 940 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 12219312 is about 3495.6132509189. The cubic root of 12219312 is about 230.3291569425.

Subtracting from 12219312 its product of digits (216), we obtain a triangular number (12219096 = T₄₉₄₃).

The spelling of 12219312 in words is "twelve million, two hundred nineteen thousand, three hundred twelve".