885809 has 6 divisors (see below), whose sum is σ = 907314. Its totient is φ = 864800.

The previous prime is 885803. The next prime is 885811. The reversal of 885809 is 908588.

It can be written as a sum of positive squares in only one way, i.e., 883600 + 2209 = 940^2 + 47^2 .

It is not a de Polignac number, because 885809 - 2⁴ = 885793 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (885803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2009 + ... + 2409.

It is an arithmetic number, because the mean of its divisors is an integer number (151219).

2⁸⁸⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

885809 is a deficient number, since it is larger than the sum of its proper divisors (21505).

885809 is an equidigital number, since it uses as much as digits as its factorization.

885809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 885809 is about 941.1742665415. The cubic root of 885809 is about 96.0387936385.

The spelling of 885809 in words is "eight hundred eighty-five thousand, eight hundred nine".