8220985 has 4 divisors (see below), whose sum is σ = 9865188. Its totient is φ = 6576784.

The previous prime is 8220937. The next prime is 8221009. The reversal of 8220985 is 5890228.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3059001 + 5161984 = 1749^2 + 2272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8220985 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8220985.

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, 822094 + ... + 822103.

It is an arithmetic number, because the mean of its divisors is an integer number (2466297).

Almost surely, 2^8220985 is an apocalyptic number.

It is an amenable number.

8220985 is a deficient number, since it is larger than the sum of its proper divisors (1644203).

8220985 is a wasteful number, since it uses less digits than its factorization.

8220985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644202.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 8220985 is about 2867.2260113217. The cubic root of 8220985 is about 201.8248408068.

The spelling of 8220985 in words is "eight million, two hundred twenty thousand, nine hundred eighty-five".