8218985 has 4 divisors (see below), whose sum is σ = 9862788. Its totient is φ = 6575184.

The previous prime is 8218961. The next prime is 8218993. The reversal of 8218985 is 5898128.

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 891136 + 7327849 = 944^2 + 2707^2 .

It is a cyclic number.

It is not a de Polignac number, because 8218985 - 2⁸ = 8218729 is a prime.

It is a Duffinian 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, 821894 + ... + 821903.

It is an arithmetic number, because the mean of its divisors is an integer number (2465697).

Almost surely, 2^8218985 is an apocalyptic number.

It is an amenable number.

8218985 is a deficient number, since it is larger than the sum of its proper divisors (1643803).

8218985 is a wasteful number, since it uses less digits than its factorization.

8218985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643802.

The product of its digits is 46080, while the sum is 41.

The square root of 8218985 is about 2866.8772209497. The cubic root of 8218985 is about 201.8084728404.

The spelling of 8218985 in words is "eight million, two hundred eighteen thousand, nine hundred eighty-five".