283821 has 8 divisors (see below), whose sum is σ = 383040. Its totient is φ = 186912.

The previous prime is 283817. The next prime is 283831. The reversal of 283821 is 128382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 283821 - 2² = 283817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 283791 and 283800.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 283821.

It is not an unprimeable number, because it can be changed into a prime (283831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265 + ... + 798.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

2²⁸³⁸²¹ is an apocalyptic number.

It is an amenable number.

283821 is a deficient number, since it is larger than the sum of its proper divisors (99219).

283821 is a wasteful number, since it uses less digits than its factorization.

283821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155.

The product of its digits is 768, while the sum is 24.

The square root of 283821 is about 532.7485335503. The cubic root of 283821 is about 65.7175718494.

The spelling of 283821 in words is "two hundred eighty-three thousand, eight hundred twenty-one".