120509 has 4 divisors (see below), whose sum is σ = 123804. Its totient is φ = 117216.

The previous prime is 120503. The next prime is 120511. The reversal of 120509 is 905021.

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 105625 + 14884 = 325^2 + 122^2 .

It is not a de Polignac number, because 120509 - 2¹⁶ = 54973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120503) 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, 1592 + ... + 1665.

It is an arithmetic number, because the mean of its divisors is an integer number (30951).

2¹²⁰⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

120509 is a deficient number, since it is larger than the sum of its proper divisors (3295).

120509 is an equidigital number, since it uses as much as digits as its factorization.

120509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3294.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 120509 is about 347.1440623142. The cubic root of 120509 is about 49.3938821121.

The spelling of 120509 in words is "one hundred twenty thousand, five hundred nine".