304921 has 4 divisors (see below), whose sum is σ = 309172. Its totient is φ = 300672.

The previous prime is 304907. The next prime is 304933. The reversal of 304921 is 129403.

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 235225 + 69696 = 485^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 304921 - 2¹¹ = 302873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (304901) 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, 2016 + ... + 2161.

It is an arithmetic number, because the mean of its divisors is an integer number (77293).

2³⁰⁴⁹²¹ is an apocalyptic number.

It is an amenable number.

304921 is a deficient number, since it is larger than the sum of its proper divisors (4251).

304921 is an equidigital number, since it uses as much as digits as its factorization.

304921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 304921 is about 552.1965229880. The cubic root of 304921 is about 67.3073427339.

It can be divided in two parts, 304 and 921, that added together give a triangular number (1225 = T₄₉).

The spelling of 304921 in words is "three hundred four thousand, nine hundred twenty-one".