120809 has 4 divisors (see below), whose sum is σ = 130116. Its totient is φ = 111504.

The previous prime is 120779. The next prime is 120811. The reversal of 120809 is 908021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13225 + 107584 = 115^2 + 328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120809 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (120829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4634 + ... + 4659.

It is an arithmetic number, because the mean of its divisors is an integer number (32529).

2¹²⁰⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

120809 is a deficient number, since it is larger than the sum of its proper divisors (9307).

120809 is an equidigital number, since it uses as much as digits as its factorization.

120809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9306.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 120809 is about 347.5758909936. The cubic root of 120809 is about 49.4348358591.

It can be divided in two parts, 120 and 809, that added together give a palindrome (929).

The spelling of 120809 in words is "one hundred twenty thousand, eight hundred nine".