804865 has 12 divisors (see below), whose sum is σ = 1027836. Its totient is φ = 604928.

The previous prime is 804857. The next prime is 804877. The reversal of 804865 is 568408.

It can be written as a sum of positive squares in 6 ways, for example, as 256 + 804609 = 16^2 + 897^2 .

It is not a de Polignac number, because 804865 - 2³ = 804857 is a prime.

It is a super-4 number, since 4×804865⁴ (a number of 25 digits) contains 4444 as substring.

It is a d-powerful number, because it can be written as 8⁶ + 0 + 8⁶ + 4² + 6⁷ + 5⁴ .

It is a Duffinian number.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1167 + ... + 1723.

It is an arithmetic number, because the mean of its divisors is an integer number (85653).

It is a Proth number, since it is equal to 393 ⋅ 2¹¹ + 1 and 393 < 2¹¹.

2⁸⁰⁴⁸⁶⁵ is an apocalyptic number.

804865 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

804865 is a deficient number, since it is larger than the sum of its proper divisors (222971).

804865 is a wasteful number, since it uses less digits than its factorization.

804865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 579 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 804865 is about 897.1426865332. The cubic root of 804865 is about 93.0195742511.

The spelling of 804865 in words is "eight hundred four thousand, eight hundred sixty-five".