82909 has 4 divisors (see below), whose sum is σ = 87804. Its totient is φ = 78016.

The previous prime is 82903. The next prime is 82913. The reversal of 82909 is 90928.

It is a happy number.

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 44100 + 38809 = 210^2 + 197^2 .

It is a cyclic number.

It is not a de Polignac number, because 82909 - 2⁷ = 82781 is a prime.

It is a Duffinian number.

82909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82903) 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, 2422 + ... + 2455.

It is an arithmetic number, because the mean of its divisors is an integer number (21951).

2⁸²⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

82909 is a deficient number, since it is larger than the sum of its proper divisors (4895).

82909 is a wasteful number, since it uses less digits than its factorization.

82909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4894.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 82909 is about 287.9392296996. The cubic root of 82909 is about 43.6047591809.

The spelling of 82909 in words is "eighty-two thousand, nine hundred nine".