304321 has 4 divisors (see below), whose sum is σ = 306352. Its totient is φ = 302292.

The previous prime is 304303. The next prime is 304331. The reversal of 304321 is 123403.

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 a cyclic number.

It is not a de Polignac number, because 304321 - 2⁷ = 304193 is a prime.

It is a super-2 number, since 2×304321² = 185222542082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (304301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771 + ... + 1096.

It is an arithmetic number, because the mean of its divisors is an integer number (76588).

2³⁰⁴³²¹ is an apocalyptic number.

It is an amenable number.

304321 is a deficient number, since it is larger than the sum of its proper divisors (2031).

304321 is a wasteful number, since it uses less digits than its factorization.

304321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 304321 is about 551.6529706256. The cubic root of 304321 is about 67.2631663483.

Adding to 304321 its reverse (123403), we get a palindrome (427724).

It can be divided in two parts, 3043 and 21, that multiplied together give a triangular number (63903 = T₃₅₇).

The spelling of 304321 in words is "three hundred four thousand, three hundred twenty-one", and thus it is an iban number.