165812 has 6 divisors (see below), whose sum is σ = 290178. Its totient is φ = 82904.

The previous prime is 165811. The next prime is 165817. The reversal of 165812 is 218561.

165812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 106276 + 59536 = 326^2 + 244^2 .

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20723 + ... + 20730.

It is an arithmetic number, because the mean of its divisors is an integer number (48363).

2¹⁶⁵⁸¹² is an apocalyptic number.

It is an amenable number.

165812 is a deficient number, since it is larger than the sum of its proper divisors (124366).

165812 is a wasteful number, since it uses less digits than its factorization.

165812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41457 (or 41455 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 165812 is about 407.2001964636. The cubic root of 165812 is about 54.9378913228.

The spelling of 165812 in words is "one hundred sixty-five thousand, eight hundred twelve".