9899421 has 12 divisors (see below), whose sum is σ = 15354432. Its totient is φ = 5656728.

The previous prime is 9899377. The next prime is 9899429. The reversal of 9899421 is 1249989.

9899421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9899421 - 2¹⁰ = 9898397 is a prime.

It is a super-2 number, since 2×9899421² = 195997072270482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9899429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33525 + ... + 33818.

It is an arithmetic number, because the mean of its divisors is an integer number (1279536).

Almost surely, 2^9899421 is an apocalyptic number.

It is an amenable number.

9899421 is a deficient number, since it is larger than the sum of its proper divisors (5455011).

9899421 is a wasteful number, since it uses less digits than its factorization.

9899421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67360 (or 67353 counting only the distinct ones).

The product of its digits is 46656, while the sum is 42.

The square root of 9899421 is about 3146.3345340253. The cubic root of 9899421 is about 214.7187308079.

The spelling of 9899421 in words is "nine million, eight hundred ninety-nine thousand, four hundred twenty-one".