168909 has 16 divisors (see below), whose sum is σ = 249984. Its totient is φ = 100800.

The previous prime is 168901. The next prime is 168913. The reversal of 168909 is 909861.

It is a happy number.

It is not a de Polignac number, because 168909 - 2³ = 168901 is a prime.

It is an Ulam number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 168909.

It is a congruent 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, 2344 + ... + 2414.

It is an arithmetic number, because the mean of its divisors is an integer number (15624).

2¹⁶⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

168909 is a deficient number, since it is larger than the sum of its proper divisors (81075).

168909 is a wasteful number, since it uses less digits than its factorization.

168909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 168909 is about 410.9854012006. The cubic root of 168909 is about 55.2778229132.

The spelling of 168909 in words is "one hundred sixty-eight thousand, nine hundred nine".