8219866 has 4 divisors (see below), whose sum is σ = 12329802. Its totient is φ = 4109932.

The previous prime is 8219851. The next prime is 8219879. The reversal of 8219866 is 6689128.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7722841 + 497025 = 2779^2 + 705^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2054965 + ... + 2054968.

Almost surely, 2^8219866 is an apocalyptic number.

8219866 is a deficient number, since it is larger than the sum of its proper divisors (4109936).

8219866 is a wasteful number, since it uses less digits than its factorization.

8219866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4109935.

The product of its digits is 41472, while the sum is 40.

The square root of 8219866 is about 2867.0308683375. The cubic root of 8219866 is about 201.8156832568.

The spelling of 8219866 in words is "eight million, two hundred nineteen thousand, eight hundred sixty-six".