12728043 has 32 divisors (see below), whose sum is σ = 20345600. Its totient is φ = 7838208.

The previous prime is 12728041. The next prime is 12728047. The reversal of 12728043 is 34082721.

It is not a de Polignac number, because 12728043 - 2¹ = 12728041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12727998 and 12728016.

It is not an unprimeable number, because it can be changed into a prime (12728041) 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 31 ways as a sum of consecutive naturals, for example, 21771 + ... + 22347.

It is an arithmetic number, because the mean of its divisors is an integer number (635800).

Almost surely, 2^12728043 is an apocalyptic number.

12728043 is a deficient number, since it is larger than the sum of its proper divisors (7617557).

12728043 is a wasteful number, since it uses less digits than its factorization.

12728043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 12728043 is about 3567.6382944463. The cubic root of 12728043 is about 233.4822543666.

The spelling of 12728043 in words is "twelve million, seven hundred twenty-eight thousand, forty-three".