12191728 has 10 divisors (see below), whose sum is σ = 23621504. Its totient is φ = 6095856.

The previous prime is 12191717. The next prime is 12191741. The reversal of 12191728 is 82719121.

12191728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 12191728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 380976 + ... + 381007.

Almost surely, 2^12191728 is an apocalyptic number.

It is an amenable number.

12191728 is a deficient number, since it is larger than the sum of its proper divisors (11429776).

12191728 is an equidigital number, since it uses as much as digits as its factorization.

12191728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761991 (or 761985 counting only the distinct ones).

The product of its digits is 2016, while the sum is 31.

The square root of 12191728 is about 3491.6655051708. The cubic root of 12191728 is about 230.1557105648.

The spelling of 12191728 in words is "twelve million, one hundred ninety-one thousand, seven hundred twenty-eight".