12728447 has 2 divisors, whose sum is σ = 12728448. Its totient is φ = 12728446.

The previous prime is 12728389. The next prime is 12728479. The reversal of 12728447 is 74482721.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12728447 - 2¹² = 12724351 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12728047) 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, 6364223 + 6364224.

It is an arithmetic number, because the mean of its divisors is an integer number (6364224).

Almost surely, 2^12728447 is an apocalyptic number.

12728447 is a deficient number, since it is larger than the sum of its proper divisors (1).

12728447 is an equidigital number, since it uses as much as digits as its factorization.

12728447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25088, while the sum is 35.

The square root of 12728447 is about 3567.6949140867. The cubic root of 12728447 is about 233.4847246555.

The spelling of 12728447 in words is "twelve million, seven hundred twenty-eight thousand, four hundred forty-seven".