12428217 has 6 divisors (see below), whose sum is σ = 17951882. Its totient is φ = 8285472.

The previous prime is 12428203. The next prime is 12428219. The reversal of 12428217 is 71282421.

12428217 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7338681 + 5089536 = 2709^2 + 2256^2 .

It is not a de Polignac number, because 12428217 - 2⁷ = 12428089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12428219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 690448 + ... + 690465.

Almost surely, 2^12428217 is an apocalyptic number.

It is an amenable number.

12428217 is a deficient number, since it is larger than the sum of its proper divisors (5523665).

12428217 is a wasteful number, since it uses less digits than its factorization.

12428217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380919 (or 1380916 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 12428217 is about 3525.3676404029. The cubic root of 12428217 is about 231.6343390071.

The spelling of 12428217 in words is "twelve million, four hundred twenty-eight thousand, two hundred seventeen".