820939 has 8 divisors (see below), whose sum is σ = 979200. Its totient is φ = 672936.

The previous prime is 820927. The next prime is 820957. The reversal of 820939 is 939028.

It is a happy number.

820939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 820939 - 2⁵ = 820907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 820939.

It is not an unprimeable number, because it can be changed into a prime (820909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2389 + ... + 2710.

It is an arithmetic number, because the mean of its divisors is an integer number (122400).

2⁸²⁰⁹³⁹ is an apocalyptic number.

820939 is a deficient number, since it is larger than the sum of its proper divisors (158261).

820939 is a wasteful number, since it uses less digits than its factorization.

820939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 820939 is about 906.0568414840. The cubic root of 820939 is about 93.6347300320.

It can be divided in two parts, 82093 and 9, that multiplied together give a palindrome (738837).

The spelling of 820939 in words is "eight hundred twenty thousand, nine hundred thirty-nine".