12812816 has 10 divisors (see below), whose sum is σ = 24824862. Its totient is φ = 6406400.

The previous prime is 12812801. The next prime is 12812819. The reversal of 12812816 is 61821821.

It can be written as a sum of positive squares in only one way, i.e., 10240000 + 2572816 = 3200^2 + 1604^2 .

It is not an unprimeable number, because it can be changed into a prime (12812819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400385 + ... + 400416.

Almost surely, 2^12812816 is an apocalyptic number.

12812816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12812816 is a deficient number, since it is larger than the sum of its proper divisors (12012046).

12812816 is an equidigital number, since it uses as much as digits as its factorization.

12812816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800809 (or 800803 counting only the distinct ones).

The product of its digits is 1536, while the sum is 29.

The square root of 12812816 is about 3579.4994063416. The cubic root of 12812816 is about 233.9994642888. Note that the first 3 decimals are identical.

The spelling of 12812816 in words is "twelve million, eight hundred twelve thousand, eight hundred sixteen".