304309 has 4 divisors (see below), whose sum is σ = 307116. Its totient is φ = 301504.

The previous prime is 304303. The next prime is 304331. The reversal of 304309 is 903403.

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 49284 + 255025 = 222^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 304309 - 2³ = 304301 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 (304301) 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, 1234 + ... + 1459.

It is an arithmetic number, because the mean of its divisors is an integer number (76779).

2³⁰⁴³⁰⁹ is an apocalyptic number.

It is an amenable number.

304309 is a deficient number, since it is larger than the sum of its proper divisors (2807).

304309 is a wasteful number, since it uses less digits than its factorization.

304309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2806.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 304309 is about 551.6420941154. The cubic root of 304309 is about 67.2622822285.

The spelling of 304309 in words is "three hundred four thousand, three hundred nine".