165869 has 8 divisors (see below), whose sum is σ = 191808. Its totient is φ = 141760.

The previous prime is 165857. The next prime is 165877. The reversal of 165869 is 968561.

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

It is a cyclic number.

It is not a de Polignac number, because 165869 - 2¹² = 161773 is a prime.

It is a super-2 number, since 2×165869² = 55025050322, which contains 22 as substring.

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 (165829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257 + ... + 630.

It is an arithmetic number, because the mean of its divisors is an integer number (23976).

2¹⁶⁵⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

165869 is a deficient number, since it is larger than the sum of its proper divisors (25939).

165869 is a wasteful number, since it uses less digits than its factorization.

165869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915.

The product of its digits is 12960, while the sum is 35.

The square root of 165869 is about 407.2701805927. The cubic root of 165869 is about 54.9441858030.

It can be divided in two parts, 16 and 5869, that added together give a palindrome (5885).

The spelling of 165869 in words is "one hundred sixty-five thousand, eight hundred sixty-nine".