282721 has 4 divisors (see below), whose sum is σ = 292500. Its totient is φ = 272944.

The previous prime is 282713. The next prime is 282767. The reversal of 282721 is 127282.

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 90000 + 192721 = 300^2 + 439^2 .

It is a cyclic number.

It is not a de Polignac number, because 282721 - 2³ = 282713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 282692 and 282701.

It is not an unprimeable number, because it can be changed into a prime (282221) 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, 4846 + ... + 4903.

It is an arithmetic number, because the mean of its divisors is an integer number (73125).

2²⁸²⁷²¹ is an apocalyptic number.

It is an amenable number.

282721 is a deficient number, since it is larger than the sum of its proper divisors (9779).

282721 is an equidigital number, since it uses as much as digits as its factorization.

282721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9778.

The product of its digits is 448, while the sum is 22.

The square root of 282721 is about 531.7151493046. The cubic root of 282721 is about 65.6325617893.

The spelling of 282721 in words is "two hundred eighty-two thousand, seven hundred twenty-one".