4449821 has 2 divisors, whose sum is σ = 4449822. Its totient is φ = 4449820.

The previous prime is 4449817. The next prime is 4449829. The reversal of 4449821 is 1289444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2656900 + 1792921 = 1630^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 4449821 - 2² = 4449817 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4449829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2224910 + 2224911.

It is an arithmetic number, because the mean of its divisors is an integer number (2224911).

Almost surely, 2^4449821 is an apocalyptic number.

It is an amenable number.

4449821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4449821 is an equidigital number, since it uses as much as digits as its factorization.

4449821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 32.

The square root of 4449821 is about 2109.4598834773. The cubic root of 4449821 is about 164.4804102034.

The spelling of 4449821 in words is "four million, four hundred forty-nine thousand, eight hundred twenty-one".