12820866 has 8 divisors (see below), whose sum is σ = 25641744. Its totient is φ = 4273620.

The previous prime is 12820853. The next prime is 12820879. The reversal of 12820866 is 66802821.

It is an interprime number because it is at equal distance from previous prime (12820853) and next prime (12820879).

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

12820866 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068400 + ... + 1068411.

It is an arithmetic number, because the mean of its divisors is an integer number (3205218).

Almost surely, 2^12820866 is an apocalyptic number.

12820866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12820866 is a wasteful number, since it uses less digits than its factorization.

12820866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136816.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 12820866 is about 3580.6236886889. The cubic root of 12820866 is about 234.0484595378.

The spelling of 12820866 in words is "twelve million, eight hundred twenty thousand, eight hundred sixty-six".