8221986 has 20 divisors (see below), whose sum is σ = 18423702. Its totient is φ = 2740608.

The previous prime is 8221981. The next prime is 8221991. The reversal of 8221986 is 6891228.

8221986 = T₁₂₉ + T₁₃₀ + ... + T₃₇₁.

It is an interprime number because it is at equal distance from previous prime (8221981) and next prime (8221991).

It can be written as a sum of positive squares in only one way, i.e., 5267025 + 2954961 = 2295^2 + 1719^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8221986.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221981) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 25215 + ... + 25538.

Almost surely, 2^8221986 is an apocalyptic number.

8221986 is an abundant number, since it is smaller than the sum of its proper divisors (10201716).

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

8221986 is a wasteful number, since it uses less digits than its factorization.

8221986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50767 (or 50758 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 8221986 is about 2867.4005649717. The cubic root of 8221986 is about 201.8330319772.

The spelling of 8221986 in words is "eight million, two hundred twenty-one thousand, nine hundred eighty-six".