9984421 has 2 divisors, whose sum is σ = 9984422. Its totient is φ = 9984420.

The previous prime is 9984397. The next prime is 9984431. The reversal of 9984421 is 1244899.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9641025 + 343396 = 3105^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 9984421 - 2¹¹ = 9982373 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9984431) 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, 4992210 + 4992211.

It is an arithmetic number, because the mean of its divisors is an integer number (4992211).

Almost surely, 2^9984421 is an apocalyptic number.

It is an amenable number.

9984421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9984421 is an equidigital number, since it uses as much as digits as its factorization.

9984421 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 9984421 is about 3159.8134438603. The cubic root of 9984421 is about 215.3315310602.

The spelling of 9984421 in words is "nine million, nine hundred eighty-four thousand, four hundred twenty-one".