820339 has 4 divisors (see below), whose sum is σ = 883456. Its totient is φ = 757224.

The previous prime is 820333. The next prime is 820343. The reversal of 820339 is 933028.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 820339 - 2³ = 820331 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (820331) 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, 31539 + ... + 31564.

It is an arithmetic number, because the mean of its divisors is an integer number (220864).

2⁸²⁰³³⁹ is an apocalyptic number.

820339 is a deficient number, since it is larger than the sum of its proper divisors (63117).

820339 is a wasteful number, since it uses less digits than its factorization.

820339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63116.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 820339 is about 905.7256759086. The cubic root of 820339 is about 93.6119128554.

The spelling of 820339 in words is "eight hundred twenty thousand, three hundred thirty-nine".