8684809 has 9 divisors (see below), whose sum is σ = 10126791. Its totient is φ = 7426440.

The previous prime is 8684789. The next prime is 8684821. The reversal of 8684809 is 9084868.

The square root of 8684809 is 2947.

It is a perfect power (a square), and thus also a powerful number.

8684809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 41209 + 8643600 = 203^2 + 2940^2 .

It is not a de Polignac number, because 8684809 - 2¹⁵ = 8652041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8684009) 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 8 ways as a sum of consecutive naturals, for example, 20419 + ... + 20839.

It is an arithmetic number, because the mean of its divisors is an integer number (1125199).

Almost surely, 2^8684809 is an apocalyptic number.

8684809 is the 2947-th square number.

8684809 is the 1474-th centered octagonal number.

It is an amenable number.

8684809 is a deficient number, since it is larger than the sum of its proper divisors (1441982).

8684809 is an frugal number, since it uses more digits than its factorization.

8684809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The cubic root of 8684809 is about 205.5512350470.

The spelling of 8684809 in words is "eight million, six hundred eighty-four thousand, eight hundred nine".