12428917 has 4 divisors (see below), whose sum is σ = 12468940. Its totient is φ = 12388896.

The previous prime is 12428909. The next prime is 12428951. The reversal of 12428917 is 71982421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4844401 + 7584516 = 2201^2 + 2754^2 .

It is a cyclic number.

It is not a de Polignac number, because 12428917 - 2³ = 12428909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12428987) 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, 19542 + ... + 20167.

It is an arithmetic number, because the mean of its divisors is an integer number (3117235).

Almost surely, 2^12428917 is an apocalyptic number.

It is an amenable number.

12428917 is a deficient number, since it is larger than the sum of its proper divisors (40023).

12428917 is an equidigital number, since it uses as much as digits as its factorization.

12428917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40022.

The product of its digits is 8064, while the sum is 34.

The square root of 12428917 is about 3525.4669194307. The cubic root of 12428917 is about 231.6386877401.

The spelling of 12428917 in words is "twelve million, four hundred twenty-eight thousand, nine hundred seventeen".