12315728 has 10 divisors (see below), whose sum is σ = 23861754. Its totient is φ = 6157856.

The previous prime is 12315727. The next prime is 12315811. The reversal of 12315728 is 82751321.

It can be written as a sum of positive squares in only one way, i.e., 11916304 + 399424 = 3452^2 + 632^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12315728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12315727) by changing a digit.

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 as a sum of consecutive naturals, namely, 384851 + ... + 384882.

Almost surely, 2^12315728 is an apocalyptic number.

It is an amenable number.

12315728 is a deficient number, since it is larger than the sum of its proper divisors (11546026).

12315728 is an equidigital number, since it uses as much as digits as its factorization.

12315728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769741 (or 769735 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 12315728 is about 3509.3771527153. The cubic root of 12315728 is about 230.9333715874.

It can be divided in two parts, 123 and 15728, that added together give a palindrome (15851).

The spelling of 12315728 in words is "twelve million, three hundred fifteen thousand, seven hundred twenty-eight".