12728123 has 2 divisors, whose sum is σ = 12728124. Its totient is φ = 12728122.

The previous prime is 12728113. The next prime is 12728159. The reversal of 12728123 is 32182721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12728123 - 2¹² = 12724027 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 12728092 and 12728101.

It is not a weakly prime, because it can be changed into another prime (12728113) 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, 6364061 + 6364062.

It is an arithmetic number, because the mean of its divisors is an integer number (6364062).

Almost surely, 2^12728123 is an apocalyptic number.

12728123 is a deficient number, since it is larger than the sum of its proper divisors (1).

12728123 is an equidigital number, since it uses as much as digits as its factorization.

12728123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 26.

The square root of 12728123 is about 3567.6495063277. The cubic root of 12728123 is about 233.4827435369.

The spelling of 12728123 in words is "twelve million, seven hundred twenty-eight thousand, one hundred twenty-three".