9944821 has 2 divisors, whose sum is σ = 9944822. Its totient is φ = 9944820.

The previous prime is 9944807. The next prime is 9944839. The reversal of 9944821 is 1284499.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7102225 + 2842596 = 2665^2 + 1686^2 .

It is a cyclic number.

It is not a de Polignac number, because 9944821 - 2⁵ = 9944789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9944801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972410 + 4972411.

It is an arithmetic number, because the mean of its divisors is an integer number (4972411).

Almost surely, 2^9944821 is an apocalyptic number.

It is an amenable number.

9944821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9944821 is an equidigital number, since it uses as much as digits as its factorization.

9944821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 9944821 is about 3153.5410255774. The cubic root of 9944821 is about 215.0464727376.

The spelling of 9944821 in words is "nine million, nine hundred forty-four thousand, eight hundred twenty-one".