12428789 has 4 divisors (see below), whose sum is σ = 12439020. Its totient is φ = 12418560.

The previous prime is 12428771. The next prime is 12428803. The reversal of 12428789 is 98782421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3034564 + 9394225 = 1742^2 + 3065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12428789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12428729) 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, 3002 + ... + 5819.

It is an arithmetic number, because the mean of its divisors is an integer number (3109755).

Almost surely, 2^12428789 is an apocalyptic number.

It is an amenable number.

12428789 is a deficient number, since it is larger than the sum of its proper divisors (10231).

12428789 is an equidigital number, since it uses as much as digits as its factorization.

12428789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10230.

The product of its digits is 64512, while the sum is 41.

The square root of 12428789 is about 3525.4487657602. The cubic root of 12428789 is about 231.6378925554.

The spelling of 12428789 in words is "twelve million, four hundred twenty-eight thousand, seven hundred eighty-nine".