163805 has 6 divisors (see below), whose sum is σ = 197658. Its totient is φ = 130320.

The previous prime is 163789. The next prime is 163811. The reversal of 163805 is 508361.

It can be written as a sum of positive squares in 3 ways, for example, as 20164 + 143641 = 142^2 + 379^2 .

It is not a de Polignac number, because 163805 - 2⁴ = 163789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 815 + ... + 995.

It is an arithmetic number, because the mean of its divisors is an integer number (32943).

2¹⁶³⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

163805 is a deficient number, since it is larger than the sum of its proper divisors (33853).

163805 is an frugal number, since it uses more digits than its factorization.

163805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 163805 is about 404.7283039275. The cubic root of 163805 is about 54.7153335866.

Multiplying 163805 by its product of nonzero digits (720), we get a square (117939600 = 10860²).

The spelling of 163805 in words is "one hundred sixty-three thousand, eight hundred five".