304821 has 12 divisors (see below), whose sum is σ = 480480. Its totient is φ = 184680.

The previous prime is 304813. The next prime is 304831. The reversal of 304821 is 128403.

It is a happy number.

304821 is nontrivially palindromic in base 13.

It is not a de Polignac number, because 304821 - 2³ = 304813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 304794 and 304803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1441 + ... + 1638.

It is an arithmetic number, because the mean of its divisors is an integer number (40040).

2³⁰⁴⁸²¹ is an apocalyptic number.

It is an amenable number.

304821 is a deficient number, since it is larger than the sum of its proper divisors (175659).

304821 is a wasteful number, since it uses less digits than its factorization.

304821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096 (or 3093 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 304821 is about 552.1059680895. The cubic root of 304821 is about 67.2999840299.

It can be divided in two parts, 30 and 4821, that added together give a triangular number (4851 = T₉₈).

The spelling of 304821 in words is "three hundred four thousand, eight hundred twenty-one".