117865 has 8 divisors (see below), whose sum is σ = 154368. Its totient is φ = 85680.

The previous prime is 117851. The next prime is 117877. The reversal of 117865 is 568711.

117865 = 43² + 44² + ... + 75².

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 117865 - 2⁵ = 117833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1017 + ... + 1126.

It is an arithmetic number, because the mean of its divisors is an integer number (19296).

2¹¹⁷⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

117865 is a deficient number, since it is larger than the sum of its proper divisors (36503).

117865 is a wasteful number, since it uses less digits than its factorization.

117865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159.

The product of its digits is 1680, while the sum is 28.

The square root of 117865 is about 343.3147244148. The cubic root of 117865 is about 49.0299691719.

The spelling of 117865 in words is "one hundred seventeen thousand, eight hundred sixty-five".