8181866 has 16 divisors (see below), whose sum is σ = 15301440. Its totient is φ = 3187680.

The previous prime is 8181851. The next prime is 8181871. The reversal of 8181866 is 6681818.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26411 + ... + 26718.

It is an arithmetic number, because the mean of its divisors is an integer number (956340).

Almost surely, 2^8181866 is an apocalyptic number.

8181866 is a deficient number, since it is larger than the sum of its proper divisors (7119574).

8181866 is a wasteful number, since it uses less digits than its factorization.

8181866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53149.

The product of its digits is 18432, while the sum is 38.

The square root of 8181866 is about 2860.3961264133. The cubic root of 8181866 is about 201.5042084227.

The spelling of 8181866 in words is "eight million, one hundred eighty-one thousand, eight hundred sixty-six".