4406821 has 2 divisors, whose sum is σ = 4406822. Its totient is φ = 4406820.

The previous prime is 4406819. The next prime is 4406827. The reversal of 4406821 is 1286044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3744225 + 662596 = 1935^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 4406821 - 2¹ = 4406819 is a prime.

Together with 4406819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4406827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2203410 + 2203411.

It is an arithmetic number, because the mean of its divisors is an integer number (2203411).

Almost surely, 2^4406821 is an apocalyptic number.

It is an amenable number.

4406821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4406821 is an equidigital number, since it uses as much as digits as its factorization.

4406821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 4406821 is about 2099.2429587830. The cubic root of 4406821 is about 163.9488860142.

The spelling of 4406821 in words is "four million, four hundred six thousand, eight hundred twenty-one".