2882821 has 4 divisors (see below), whose sum is σ = 2886444. Its totient is φ = 2879200.

The previous prime is 2882807. The next prime is 2882837. The reversal of 2882821 is 1282882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1282882 = 2 ⋅641441.

It can be written as a sum of positive squares in 2 ways, for example, as 1476225 + 1406596 = 1215^2 + 1186^2 .

It is a cyclic number.

It is not a de Polignac number, because 2882821 - 2⁹ = 2882309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2882801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40 + ... + 2401.

It is an arithmetic number, because the mean of its divisors is an integer number (721611).

2^2882821 is an apocalyptic number.

It is an amenable number.

2882821 is a deficient number, since it is larger than the sum of its proper divisors (3623).

2882821 is a wasteful number, since it uses less digits than its factorization.

2882821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622.

The product of its digits is 4096, while the sum is 31.

The square root of 2882821 is about 1697.8872165135. The cubic root of 2882821 is about 142.3221707057.

The spelling of 2882821 in words is "two million, eight hundred eighty-two thousand, eight hundred twenty-one".