163809 has 8 divisors (see below), whose sum is σ = 242720. Its totient is φ = 109188.

The previous prime is 163789. The next prime is 163811. The reversal of 163809 is 908361.

It is not a de Polignac number, because 163809 - 2¹¹ = 161761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 6067 = 163809 / (1 + 6 + 3 + 8 + 0 + 9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (163819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3007 + ... + 3060.

It is an arithmetic number, because the mean of its divisors is an integer number (30340).

2¹⁶³⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

163809 is a deficient number, since it is larger than the sum of its proper divisors (78911).

163809 is an equidigital number, since it uses as much as digits as its factorization.

163809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6076 (or 6070 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 163809 is about 404.7332454840. The cubic root of 163809 is about 54.7157789526.

The spelling of 163809 in words is "one hundred sixty-three thousand, eight hundred nine".