12816685 has 12 divisors (see below), whose sum is σ = 17891388. Its totient is φ = 8788416.

The previous prime is 12816679. The next prime is 12816703. The reversal of 12816685 is 58661821.

It can be written as a sum of positive squares in 2 ways, for example, as 8892324 + 3924361 = 2982^2 + 1981^2 .

It is not a de Polignac number, because 12816685 - 2³ = 12816677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 25912 + ... + 26401.

It is an arithmetic number, because the mean of its divisors is an integer number (1490949).

Almost surely, 2^12816685 is an apocalyptic number.

It is an amenable number.

12816685 is a deficient number, since it is larger than the sum of its proper divisors (5074703).

12816685 is an equidigital number, since it uses as much as digits as its factorization.

12816685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52332 (or 52325 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 12816685 is about 3580.0398042480. The cubic root of 12816685 is about 234.0230150008.

The spelling of 12816685 in words is "twelve million, eight hundred sixteen thousand, six hundred eighty-five".