12428816 has 10 divisors (see below), whose sum is σ = 24080862. Its totient is φ = 6214400.

The previous prime is 12428813. The next prime is 12428827. The reversal of 12428816 is 61882421.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 38416 = 3520^2 + 196^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12428813) 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 as a sum of consecutive naturals, namely, 388385 + ... + 388416.

Almost surely, 2^12428816 is an apocalyptic number.

12428816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12428816 is a deficient number, since it is larger than the sum of its proper divisors (11652046).

12428816 is an equidigital number, since it uses as much as digits as its factorization.

12428816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776809 (or 776803 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 12428816 is about 3525.4525950578. The cubic root of 12428816 is about 231.6380602901.

The spelling of 12428816 in words is "twelve million, four hundred twenty-eight thousand, eight hundred sixteen".