8709 has 4 divisors (see below), whose sum is σ = 11616. Its totient is φ = 5804.

The previous prime is 8707. The next prime is 8713. The reversal of 8709 is 9078.

8709 = 27² + 28² + ... + 35².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8709 - 2¹ = 8707 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 8709.

It is not an unprimeable number, because it can be changed into a prime (8707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1449 + ... + 1454.

It is an arithmetic number, because the mean of its divisors is an integer number (2904).

2⁸⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

8709 is a deficient number, since it is larger than the sum of its proper divisors (2907).

8709 is a wasteful number, since it uses less digits than its factorization.

8709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 8709 is about 93.3220231242. The cubic root of 8709 is about 20.5741908218.

It can be divided in two parts, 8 and 709, that added together give a palindrome (717).

The spelling of 8709 in words is "eight thousand, seven hundred nine".