12931328 has 18 divisors (see below), whose sum is σ = 25812654. Its totient is φ = 6465536.

The previous prime is 12931327. The next prime is 12931349. The reversal of 12931328 is 82313921.

It can be written as a sum of positive squares in only one way, i.e., 12730624 + 200704 = 3568^2 + 448^2 .

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 12931328.

It is not an unprimeable number, because it can be changed into a prime (12931327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25001 + ... + 25512.

Almost surely, 2^12931328 is an apocalyptic number.

It is an amenable number.

12931328 is a deficient number, since it is larger than the sum of its proper divisors (12881326).

12931328 is an frugal number, since it uses more digits than its factorization.

12931328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50529 (or 50515 counting only the distinct ones).

The product of its digits is 2592, while the sum is 29.

The square root of 12931328 is about 3596.0155728250. The cubic root of 12931328 is about 234.7187097613.

The spelling of 12931328 in words is "twelve million, nine hundred thirty-one thousand, three hundred twenty-eight".