12728125 has 12 divisors (see below), whose sum is σ = 15913044. Its totient is φ = 10180000.

The previous prime is 12728123. The next prime is 12728159. The reversal of 12728125 is 52182721.

It can be written as a sum of positive squares in 6 ways, for example, as 12201049 + 527076 = 3493^2 + 726^2 .

It is not a de Polignac number, because 12728125 - 2¹ = 12728123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12728093 and 12728102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12728123) 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 in 11 ways as a sum of consecutive naturals, for example, 1089 + ... + 5161.

It is an arithmetic number, because the mean of its divisors is an integer number (1326087).

Almost surely, 2^12728125 is an apocalyptic number.

It is an amenable number.

12728125 is a deficient number, since it is larger than the sum of its proper divisors (3184919).

12728125 is an frugal number, since it uses more digits than its factorization.

12728125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4098 (or 4078 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 12728125 is about 3567.6497866242. The cubic root of 12728125 is about 233.4827557661.

The spelling of 12728125 in words is "twelve million, seven hundred twenty-eight thousand, one hundred twenty-five".