820239 has 16 divisors (see below), whose sum is σ = 1263360. Its totient is φ = 463680.

The previous prime is 820231. The next prime is 820241. The reversal of 820239 is 932028.

It is not a de Polignac number, because 820239 - 2³ = 820231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2779 + ... + 3059.

It is an arithmetic number, because the mean of its divisors is an integer number (78960).

2⁸²⁰²³⁹ is an apocalyptic number.

820239 is a deficient number, since it is larger than the sum of its proper divisors (443121).

820239 is a wasteful number, since it uses less digits than its factorization.

820239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 820239 is about 905.6704698730. The cubic root of 820239 is about 93.6081089110.

The spelling of 820239 in words is "eight hundred twenty thousand, two hundred thirty-nine".