165743 has 4 divisors (see below), whose sum is σ = 167400. Its totient is φ = 164088.

The previous prime is 165721. The next prime is 165749. The reversal of 165743 is 347561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165743 - 2¹⁶ = 100207 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165749) 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, 668 + ... + 881.

It is an arithmetic number, because the mean of its divisors is an integer number (41850).

2¹⁶⁵⁷⁴³ is an apocalyptic number.

165743 is a deficient number, since it is larger than the sum of its proper divisors (1657).

165743 is a wasteful number, since it uses less digits than its factorization.

165743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656.

The product of its digits is 2520, while the sum is 26.

The square root of 165743 is about 407.1154627375. The cubic root of 165743 is about 54.9302697585.

The spelling of 165743 in words is "one hundred sixty-five thousand, seven hundred forty-three".