165839 has 4 divisors (see below), whose sum is σ = 166656. Its totient is φ = 165024.

The previous prime is 165833. The next prime is 165857. The reversal of 165839 is 938561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 165839 - 2¹² = 161743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 165839.

It is not an unprimeable number, because it can be changed into a prime (165833) 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 3 ways as a sum of consecutive naturals, for example, 167 + ... + 599.

It is an arithmetic number, because the mean of its divisors is an integer number (41664).

2¹⁶⁵⁸³⁹ is an apocalyptic number.

165839 is a deficient number, since it is larger than the sum of its proper divisors (817).

165839 is an equidigital number, since it uses as much as digits as its factorization.

165839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816.

The product of its digits is 6480, while the sum is 32.

The square root of 165839 is about 407.2333483397. The cubic root of 165839 is about 54.9408730984.

The spelling of 165839 in words is "one hundred sixty-five thousand, eight hundred thirty-nine".