9884821 has 2 divisors, whose sum is σ = 9884822. Its totient is φ = 9884820.

The previous prime is 9884783. The next prime is 9884827. The reversal of 9884821 is 1284889.

9884821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9180900 + 703921 = 3030^2 + 839^2 .

It is an emirp because it is prime and its reverse (1284889) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9884821 - 2¹¹ = 9882773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9884827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4942410 + 4942411.

It is an arithmetic number, because the mean of its divisors is an integer number (4942411).

Almost surely, 2^9884821 is an apocalyptic number.

It is an amenable number.

9884821 is a deficient number, since it is larger than the sum of its proper divisors (1).

9884821 is an equidigital number, since it uses as much as digits as its factorization.

9884821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 40.

The square root of 9884821 is about 3144.0135177826. The cubic root of 9884821 is about 214.6131207295.

The spelling of 9884821 in words is "nine million, eight hundred eighty-four thousand, eight hundred twenty-one".