829805 has 4 divisors (see below), whose sum is σ = 995772. Its totient is φ = 663840.

The previous prime is 829789. The next prime is 829811. The reversal of 829805 is 508928.

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

It can be written as a sum of positive squares in 2 ways, for example, as 586756 + 243049 = 766^2 + 493^2 .

It is not a de Polignac number, because 829805 - 2⁴ = 829789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82976 + ... + 82985.

It is an arithmetic number, because the mean of its divisors is an integer number (248943).

2⁸²⁹⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

829805 is a deficient number, since it is larger than the sum of its proper divisors (165967).

829805 is a wasteful number, since it uses less digits than its factorization.

829805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165966.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 829805 is about 910.9363314744. The cubic root of 829805 is about 93.9706034530.

The spelling of 829805 in words is "eight hundred twenty-nine thousand, eight hundred five".