12219728 has 20 divisors (see below), whose sum is σ = 24031200. Its totient is φ = 6018144.

The previous prime is 12219709. The next prime is 12219737. The reversal of 12219728 is 82791221.

It is a happy number.

12219728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 12219694 and 12219703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4628 + ... + 6771.

It is an arithmetic number, because the mean of its divisors is an integer number (1201560).

Almost surely, 2^12219728 is an apocalyptic number.

It is an amenable number.

12219728 is a deficient number, since it is larger than the sum of its proper divisors (11811472).

12219728 is a wasteful number, since it uses less digits than its factorization.

12219728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11474 (or 11468 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 12219728 is about 3495.6727535626. The cubic root of 12219728 is about 230.3317707242.

The spelling of 12219728 in words is "twelve million, two hundred nineteen thousand, seven hundred twenty-eight".