8909 has 4 divisors (see below), whose sum is σ = 9120. Its totient is φ = 8700.

The previous prime is 8893. The next prime is 8923. The reversal of 8909 is 9098.

It is a happy number.

8909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9098 = 2 ⋅4549.

It is a cyclic number.

It is not a de Polignac number, because 8909 - 2⁴ = 8893 is a prime.

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

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8929) 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, 17 + ... + 134.

It is an arithmetic number, because the mean of its divisors is an integer number (2280).

2⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

8909 is a deficient number, since it is larger than the sum of its proper divisors (211).

8909 is a wasteful number, since it uses less digits than its factorization.

8909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 8909 is about 94.3874991723. The cubic root of 8909 is about 20.7304940804.

The spelling of 8909 in words is "eight thousand, nine hundred nine".