168905 has 16 divisors (see below), whose sum is σ = 229824. Its totient is φ = 118080.

The previous prime is 168901. The next prime is 168913. The reversal of 168905 is 509861.

168905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 168905 - 2² = 168901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1994 + ... + 2076.

It is an arithmetic number, because the mean of its divisors is an integer number (14364).

2¹⁶⁸⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

168905 is a deficient number, since it is larger than the sum of its proper divisors (60919).

168905 is a wasteful number, since it uses less digits than its factorization.

168905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 168905 is about 410.9805348189. The cubic root of 168905 is about 55.2773865578.

The spelling of 168905 in words is "one hundred sixty-eight thousand, nine hundred five".