117805 has 4 divisors (see below), whose sum is σ = 141372. Its totient is φ = 94240.

The previous prime is 117797. The next prime is 117809. The reversal of 117805 is 508711.

117805 = 104² + 105² + ... + 113².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508711 = 7 ⋅72673.

It can be written as a sum of positive squares in 2 ways, for example, as 33124 + 84681 = 182^2 + 291^2 .

It is not a de Polignac number, because 117805 - 2³ = 117797 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117809) 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, 11776 + ... + 11785.

It is an arithmetic number, because the mean of its divisors is an integer number (35343).

2¹¹⁷⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

117805 is a deficient number, since it is larger than the sum of its proper divisors (23567).

117805 is an equidigital number, since it uses as much as digits as its factorization.

117805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23566.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 117805 is about 343.2273299142. The cubic root of 117805 is about 49.0216480772.

The spelling of 117805 in words is "one hundred seventeen thousand, eight hundred five".