165740 has 12 divisors (see below), whose sum is σ = 348096. Its totient is φ = 66288.

The previous prime is 165721. The next prime is 165749. The reversal of 165740 is 47561.

165740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (165749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4124 + ... + 4163.

It is an arithmetic number, because the mean of its divisors is an integer number (29008).

2¹⁶⁵⁷⁴⁰ is an apocalyptic number.

165740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165740 is an abundant number, since it is smaller than the sum of its proper divisors (182356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165740 is a wasteful number, since it uses less digits than its factorization.

165740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8296 (or 8294 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 165740 is about 407.1117782624. Note that the first 3 decimals coincide. The cubic root of 165740 is about 54.9299383382.

The spelling of 165740 in words is "one hundred sixty-five thousand, seven hundred forty".