12428817 has 4 divisors (see below), whose sum is σ = 16571760. Its totient is φ = 8285876.

The previous prime is 12428813. The next prime is 12428827. The reversal of 12428817 is 71882421.

It is a happy number.

12428817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12428817 - 2² = 12428813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12428813) 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, 2071467 + ... + 2071472.

It is an arithmetic number, because the mean of its divisors is an integer number (4142940).

Almost surely, 2^12428817 is an apocalyptic number.

It is an amenable number.

12428817 is a deficient number, since it is larger than the sum of its proper divisors (4142943).

12428817 is an equidigital number, since it uses as much as digits as its factorization.

12428817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142942.

The product of its digits is 7168, while the sum is 33.

The square root of 12428817 is about 3525.4527368836. The cubic root of 12428817 is about 231.6380665025.

The spelling of 12428817 in words is "twelve million, four hundred twenty-eight thousand, eight hundred seventeen".