165798 has 24 divisors (see below), whose sum is σ = 367536. Its totient is φ = 54000.

The previous prime is 165779. The next prime is 165799. The reversal of 165798 is 897561.

165798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 165798.

It is not an unprimeable number, because it can be changed into a prime (165799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1023 + ... + 1173.

It is an arithmetic number, because the mean of its divisors is an integer number (15314).

2¹⁶⁵⁷⁹⁸ is an apocalyptic number.

165798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

165798 is an abundant number, since it is smaller than the sum of its proper divisors (201738).

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

165798 is a wasteful number, since it uses less digits than its factorization.

165798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 217 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 165798 is about 407.1830055393. The cubic root of 165798 is about 54.9363450894.

The spelling of 165798 in words is "one hundred sixty-five thousand, seven hundred ninety-eight".