804985 has 4 divisors (see below), whose sum is σ = 965988. Its totient is φ = 643984.

The previous prime is 804983. The next prime is 804989. The reversal of 804985 is 589408.

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 620944 + 184041 = 788^2 + 429^2 .

It is a cyclic number.

It is not a de Polignac number, because 804985 - 2¹ = 804983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 804985.

It is not an unprimeable number, because it can be changed into a prime (804983) 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, 80494 + ... + 80503.

It is an arithmetic number, because the mean of its divisors is an integer number (241497).

2⁸⁰⁴⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

804985 is a deficient number, since it is larger than the sum of its proper divisors (161003).

804985 is a wasteful number, since it uses less digits than its factorization.

804985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161002.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 804985 is about 897.2095630342. The cubic root of 804985 is about 93.0241968873.

The spelling of 804985 in words is "eight hundred four thousand, nine hundred eighty-five".