304509 has 4 divisors (see below), whose sum is σ = 406016. Its totient is φ = 203004.

The previous prime is 304501. The next prime is 304511. The reversal of 304509 is 905403.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 304509 - 2³ = 304501 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50749 + ... + 50754.

It is an arithmetic number, because the mean of its divisors is an integer number (101504).

2³⁰⁴⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

304509 is a deficient number, since it is larger than the sum of its proper divisors (101507).

304509 is a wasteful number, since it uses less digits than its factorization.

304509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101506.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 304509 is about 551.8233412968. The cubic root of 304509 is about 67.2770145241.

The spelling of 304509 in words is "three hundred four thousand, five hundred nine".