853805 has 4 divisors (see below), whose sum is σ = 1024572. Its totient is φ = 683040.

The previous prime is 853799. The next prime is 853807. The reversal of 853805 is 508358.

853805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508358 = 2 ⋅254179.

It can be written as a sum of positive squares in 2 ways, for example, as 362404 + 491401 = 602^2 + 701^2 .

It is a de Polignac number, because none of the positive numbers 2^k-853805 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853807) 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, 85376 + ... + 85385.

It is an arithmetic number, because the mean of its divisors is an integer number (256143).

2⁸⁵³⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

853805 is a deficient number, since it is larger than the sum of its proper divisors (170767).

853805 is a wasteful number, since it uses less digits than its factorization.

853805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170766.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 853805 is about 924.0156925074. The cubic root of 853805 is about 94.8679606093.

Subtracting from 853805 its sum of digits (29), we obtain a square (853776 = 924²).

The spelling of 853805 in words is "eight hundred fifty-three thousand, eight hundred five".