2829821 has 2 divisors, whose sum is σ = 2829822. Its totient is φ = 2829820.

The previous prime is 2829809. The next prime is 2829839. The reversal of 2829821 is 1289282.

2829821 = 1189² + 1190².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1416100 + 1413721 = 1190^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 2829821 - 2¹⁰ = 2828797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2829881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1414910 + 1414911.

It is an arithmetic number, because the mean of its divisors is an integer number (1414911).

2^2829821 is an apocalyptic number.

2829821 is the 1190-th centered square number.

It is an amenable number.

2829821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2829821 is an equidigital number, since it uses as much as digits as its factorization.

2829821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 32.

The square root of 2829821 is about 1682.2071810571. The cubic root of 2829821 is about 141.4445836764. Note that the first 3 decimals are identical.

The spelling of 2829821 in words is "two million, eight hundred twenty-nine thousand, eight hundred twenty-one".