117785 has 4 divisors (see below), whose sum is σ = 141348. Its totient is φ = 94224.

The previous prime is 117779. The next prime is 117787. The reversal of 117785 is 587711.

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 13456 + 104329 = 116^2 + 323^2 .

It is a cyclic number.

It is not a de Polignac number, because 117785 - 2⁶ = 117721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117787) 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, 11774 + ... + 11783.

It is an arithmetic number, because the mean of its divisors is an integer number (35337).

117785 is a Friedman number, since it can be written as 17*8+7^(5+1), using all its digits and the basic arithmetic operations.

2¹¹⁷⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

117785 is a deficient number, since it is larger than the sum of its proper divisors (23563).

117785 is an equidigital number, since it uses as much as digits as its factorization.

117785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23562.

The product of its digits is 1960, while the sum is 29.

The square root of 117785 is about 343.1981934684. The cubic root of 117785 is about 49.0188737511.

The spelling of 117785 in words is "one hundred seventeen thousand, seven hundred eighty-five".