8520805 has 4 divisors (see below), whose sum is σ = 10224972. Its totient is φ = 6816640.

The previous prime is 8520803. The next prime is 8520821. The reversal of 8520805 is 5080258.

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 6155361 + 2365444 = 2481^2 + 1538^2 .

It is not a de Polignac number, because 8520805 - 2¹ = 8520803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8520803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 852076 + ... + 852085.

It is an arithmetic number, because the mean of its divisors is an integer number (2556243).

Almost surely, 2^8520805 is an apocalyptic number.

It is an amenable number.

8520805 is a deficient number, since it is larger than the sum of its proper divisors (1704167).

8520805 is a wasteful number, since it uses less digits than its factorization.

8520805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704166.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 8520805 is about 2919.0417948361. The cubic root of 8520805 is about 204.2491269482.

The spelling of 8520805 in words is "eight million, five hundred twenty thousand, eight hundred five".