820959 has 4 divisors (see below), whose sum is σ = 1094616. Its totient is φ = 547304.

The previous prime is 820957. The next prime is 820969. The reversal of 820959 is 959028.

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

It is a cyclic number.

It is not a de Polignac number, because 820959 - 2¹ = 820957 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820957) 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, 136824 + ... + 136829.

It is an arithmetic number, because the mean of its divisors is an integer number (273654).

2⁸²⁰⁹⁵⁹ is an apocalyptic number.

820959 is a deficient number, since it is larger than the sum of its proper divisors (273657).

820959 is a wasteful number, since it uses less digits than its factorization.

820959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273656.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 820959 is about 906.0678782520. The cubic root of 820959 is about 93.6354904131.

The spelling of 820959 in words is "eight hundred twenty thousand, nine hundred fifty-nine".