165730 has 8 divisors (see below), whose sum is σ = 298332. Its totient is φ = 66288.

The previous prime is 165721. The next prime is 165749. The reversal of 165730 is 37561.

It can be written as a sum of positive squares in 2 ways, for example, as 165649 + 81 = 407^2 + 9^2 .

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

It is an Ulam number.

It is a plaindrome in base 14.

It is an unprimeable number.

165730 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8277 + ... + 8296.

2¹⁶⁵⁷³⁰ is an apocalyptic number.

165730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165730 is a deficient number, since it is larger than the sum of its proper divisors (132602).

165730 is a wasteful number, since it uses less digits than its factorization.

165730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16580.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 165730 is about 407.0994964379. The cubic root of 165730 is about 54.9288335748.

The spelling of 165730 in words is "one hundred sixty-five thousand, seven hundred thirty".