820879 has 8 divisors (see below), whose sum is σ = 879120. Its totient is φ = 763776.

The previous prime is 820873. The next prime is 820891. The reversal of 820879 is 978028.

It is a happy number.

820879 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 not a de Polignac number, because 820879 - 2⁹ = 820367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820873) 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, 1632 + ... + 2074.

It is an arithmetic number, because the mean of its divisors is an integer number (109890).

2⁸²⁰⁸⁷⁹ is an apocalyptic number.

820879 is a deficient number, since it is larger than the sum of its proper divisors (58241).

820879 is a wasteful number, since it uses less digits than its factorization.

820879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 820879 is about 906.0237303735. The cubic root of 820879 is about 93.6324488148.

The spelling of 820879 in words is "eight hundred twenty thousand, eight hundred seventy-nine".