9982821 has 4 divisors (see below), whose sum is σ = 13310432. Its totient is φ = 6655212.

The previous prime is 9982811. The next prime is 9982829. The reversal of 9982821 is 1282899.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 9982821 - 2¹⁷ = 9851749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9982821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9982829) 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 in 3 ways as a sum of consecutive naturals, for example, 1663801 + ... + 1663806.

It is an arithmetic number, because the mean of its divisors is an integer number (3327608).

Almost surely, 2^9982821 is an apocalyptic number.

It is an amenable number.

9982821 is a deficient number, since it is larger than the sum of its proper divisors (3327611).

9982821 is a wasteful number, since it uses less digits than its factorization.

9982821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3327610.

The product of its digits is 20736, while the sum is 39.

The square root of 9982821 is about 3159.5602542126. The cubic root of 9982821 is about 215.3200281780.

The spelling of 9982821 in words is "nine million, nine hundred eighty-two thousand, eight hundred twenty-one".