12728459 has 4 divisors (see below), whose sum is σ = 12918504. Its totient is φ = 12538416.

The previous prime is 12728447. The next prime is 12728479. The reversal of 12728459 is 95482721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12728459 - 2⁸ = 12728203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12728479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94922 + ... + 95055.

It is an arithmetic number, because the mean of its divisors is an integer number (3229626).

Almost surely, 2^12728459 is an apocalyptic number.

12728459 is a deficient number, since it is larger than the sum of its proper divisors (190045).

12728459 is an equidigital number, since it uses as much as digits as its factorization.

12728459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190044.

The product of its digits is 40320, while the sum is 38.

The square root of 12728459 is about 3567.6965958444. The cubic root of 12728459 is about 233.4847980297.

The spelling of 12728459 in words is "twelve million, seven hundred twenty-eight thousand, four hundred fifty-nine".