12428417 has 4 divisors (see below), whose sum is σ = 12442116. Its totient is φ = 12414720.

The previous prime is 12428401. The next prime is 12428431. The reversal of 12428417 is 71482421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71482421 = 563 ⋅126967.

It can be written as a sum of positive squares in 2 ways, for example, as 11296321 + 1132096 = 3361^2 + 1064^2 .

It is a cyclic number.

It is not a de Polignac number, because 12428417 - 2⁴ = 12428401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12428417.

It is not an unprimeable number, because it can be changed into a prime (12428467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5384 + ... + 7337.

It is an arithmetic number, because the mean of its divisors is an integer number (3110529).

Almost surely, 2^12428417 is an apocalyptic number.

It is an amenable number.

12428417 is a deficient number, since it is larger than the sum of its proper divisors (13699).

12428417 is an equidigital number, since it uses as much as digits as its factorization.

12428417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13698.

The product of its digits is 3584, while the sum is 29.

The square root of 12428417 is about 3525.3960061247. The cubic root of 12428417 is about 231.6355815189.

The spelling of 12428417 in words is "twelve million, four hundred twenty-eight thousand, four hundred seventeen".