8215985 has 4 divisors (see below), whose sum is σ = 9859188. Its totient is φ = 6572784.

The previous prime is 8215973. The next prime is 8215993. The reversal of 8215985 is 5895128.

8215985 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 1825201 + 6390784 = 1351^2 + 2528^2 .

It is a cyclic number.

It is not a de Polignac number, because 8215985 - 2⁴ = 8215969 is a prime.

It is an Ulam number.

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, 821594 + ... + 821603.

It is an arithmetic number, because the mean of its divisors is an integer number (2464797).

Almost surely, 2^8215985 is an apocalyptic number.

It is an amenable number.

8215985 is a deficient number, since it is larger than the sum of its proper divisors (1643203).

8215985 is a wasteful number, since it uses less digits than its factorization.

8215985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643202.

The product of its digits is 28800, while the sum is 38.

The square root of 8215985 is about 2866.3539558122. The cubic root of 8215985 is about 201.7839159113.

The spelling of 8215985 in words is "eight million, two hundred fifteen thousand, nine hundred eighty-five".