12728539 has 2 divisors, whose sum is σ = 12728540. Its totient is φ = 12728538.

The previous prime is 12728519. The next prime is 12728549. The reversal of 12728539 is 93582721.

12728539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12728539 - 2¹³ = 12720347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12728498 and 12728507.

It is not a weakly prime, because it can be changed into another prime (12728509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6364269 + 6364270.

It is an arithmetic number, because the mean of its divisors is an integer number (6364270).

Almost surely, 2^12728539 is an apocalyptic number.

12728539 is a deficient number, since it is larger than the sum of its proper divisors (1).

12728539 is an equidigital number, since it uses as much as digits as its factorization.

12728539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 12728539 is about 3567.7078075425. The cubic root of 12728539 is about 233.4852871893.

The spelling of 12728539 in words is "twelve million, seven hundred twenty-eight thousand, five hundred thirty-nine".