8205845 has 8 divisors (see below), whose sum is σ = 9885240. Its totient is φ = 6539200.

The previous prime is 8205839. The next prime is 8205859. The reversal of 8205845 is 5485028.

It can be written as a sum of positive squares in 4 ways, for example, as 128881 + 8076964 = 359^2 + 2842^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8205845 - 2⁴ = 8205829 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1706 + ... + 4395.

It is an arithmetic number, because the mean of its divisors is an integer number (1235655).

Almost surely, 2^8205845 is an apocalyptic number.

It is an amenable number.

8205845 is a deficient number, since it is larger than the sum of its proper divisors (1679395).

8205845 is a wasteful number, since it uses less digits than its factorization.

8205845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6375.

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 8205845 is about 2864.5846121209. The cubic root of 8205845 is about 201.7008692151.

The spelling of 8205845 in words is "eight million, two hundred five thousand, eight hundred forty-five".