820895 has 8 divisors (see below), whose sum is σ = 1037040. Its totient is φ = 622080.

The previous prime is 820891. The next prime is 820901. The reversal of 820895 is 598028.

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

It is not a de Polignac number, because 820895 - 2² = 820891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820891) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4226 + ... + 4415.

It is an arithmetic number, because the mean of its divisors is an integer number (129630).

2⁸²⁰⁸⁹⁵ is an apocalyptic number.

820895 is a deficient number, since it is larger than the sum of its proper divisors (216145).

820895 is a wasteful number, since it uses less digits than its factorization.

820895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8665.

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

The square root of 820895 is about 906.0325601213. The cubic root of 820895 is about 93.6330571502.

The spelling of 820895 in words is "eight hundred twenty thousand, eight hundred ninety-five".