8684509 has 4 divisors (see below), whose sum is σ = 8826940. Its totient is φ = 8542080.

The previous prime is 8684503. The next prime is 8684513. The reversal of 8684509 is 9054868.

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 2544025 + 6140484 = 1595^2 + 2478^2 .

It is a cyclic number.

It is not a de Polignac number, because 8684509 - 2¹⁷ = 8553437 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 (8684503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71124 + ... + 71245.

It is an arithmetic number, because the mean of its divisors is an integer number (2206735).

Almost surely, 2^8684509 is an apocalyptic number.

It is an amenable number.

8684509 is a deficient number, since it is larger than the sum of its proper divisors (142431).

8684509 is a wasteful number, since it uses less digits than its factorization.

8684509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142430.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 8684509 is about 2946.9491003409. The cubic root of 8684509 is about 205.5488682293.

The spelling of 8684509 in words is "eight million, six hundred eighty-four thousand, five hundred nine".