159809 has 8 divisors (see below), whose sum is σ = 181440. Its totient is φ = 139536.

The previous prime is 159799. The next prime is 159811. The reversal of 159809 is 908951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 159809 - 2⁴ = 159793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159839) 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, 77 + ... + 570.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2¹⁵⁹⁸⁰⁹ is an apocalyptic number.

159809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

159809 is a deficient number, since it is larger than the sum of its proper divisors (21631).

159809 is a wasteful number, since it uses less digits than its factorization.

159809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 159809 is about 399.7611787055. The cubic root of 159809 is about 54.2667414901.

The spelling of 159809 in words is "one hundred fifty-nine thousand, eight hundred nine".