165389 has 4 divisors (see below), whose sum is σ = 189024. Its totient is φ = 141756.

The previous prime is 165383. The next prime is 165391. The reversal of 165389 is 983561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 983561 = 563 ⋅1747.

It is a cyclic number.

It is not a de Polignac number, because 165389 - 2⁸ = 165133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11807 + ... + 11820.

It is an arithmetic number, because the mean of its divisors is an integer number (47256).

2¹⁶⁵³⁸⁹ is an apocalyptic number.

It is an amenable number.

165389 is a deficient number, since it is larger than the sum of its proper divisors (23635).

165389 is an equidigital number, since it uses as much as digits as its factorization.

165389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23634.

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

The square root of 165389 is about 406.6804642468. The cubic root of 165389 is about 54.8911345191.

The spelling of 165389 in words is "one hundred sixty-five thousand, three hundred eighty-nine".