12806818 has 8 divisors (see below), whose sum is σ = 19280412. Its totient is φ = 6380016.

The previous prime is 12806749. The next prime is 12806861. The reversal of 12806818 is 81860821.

It can be written as a sum of positive squares in 2 ways, for example, as 9223369 + 3583449 = 3037^2 + 1893^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 11005 + ... + 12112.

Almost surely, 2^12806818 is an apocalyptic number.

12806818 is a deficient number, since it is larger than the sum of its proper divisors (6473594).

12806818 is a wasteful number, since it uses less digits than its factorization.

12806818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23396.

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 12806818 is about 3578.6614816157. The cubic root of 12806818 is about 233.9629449202.

The spelling of 12806818 in words is "twelve million, eight hundred six thousand, eight hundred eighteen".