165723 has 8 divisors (see below), whose sum is σ = 227088. Its totient is φ = 107424.

The previous prime is 165721. The next prime is 165749. The reversal of 165723 is 327561.

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

It is not a de Polignac number, because 165723 - 2¹ = 165721 is a prime.

It is a super-2 number, since 2×165723² = 54928225458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165693 and 165702.

It is not an unprimeable number, because it can be changed into a prime (165721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 636 + ... + 857.

It is an arithmetic number, because the mean of its divisors is an integer number (28386).

2¹⁶⁵⁷²³ is an apocalyptic number.

165723 is a deficient number, since it is larger than the sum of its proper divisors (61365).

165723 is a wasteful number, since it uses less digits than its factorization.

165723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533.

The product of its digits is 1260, while the sum is 24.

The square root of 165723 is about 407.0908989403. The cubic root of 165723 is about 54.9280602140.

It can be divided in two parts, 165 and 723, that added together give a palindrome (888).

The spelling of 165723 in words is "one hundred sixty-five thousand, seven hundred twenty-three".