169809 has 12 divisors (see below), whose sum is σ = 238896. Its totient is φ = 107272.

The previous prime is 169789. The next prime is 169817. The reversal of 169809 is 908961.

It is a happy number.

169809 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 169809 - 2⁵ = 169777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 169809.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 169809.

It is not an unprimeable number, because it can be changed into a prime (169859) 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, 1534 + ... + 1640.

It is an arithmetic number, because the mean of its divisors is an integer number (19908).

2¹⁶⁹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

169809 is a deficient number, since it is larger than the sum of its proper divisors (69087).

169809 is a wasteful number, since it uses less digits than its factorization.

169809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 133 counting only the distinct ones).

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

The square root of 169809 is about 412.0788759449. The cubic root of 169809 is about 55.3758282296.

The spelling of 169809 in words is "one hundred sixty-nine thousand, eight hundred nine".