9921834 has 48 divisors (see below), whose sum is σ = 23423400. Its totient is φ = 3017088.

The previous prime is 9921827. The next prime is 9921851. The reversal of 9921834 is 4381299.

9921834 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6517809 + 3404025 = 2553^2 + 1845^2 .

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25312 + ... + 25700.

Almost surely, 2^9921834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9921834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11711700).

9921834 is an abundant number, since it is smaller than the sum of its proper divisors (13501566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9921834 is a wasteful number, since it uses less digits than its factorization.

9921834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 516 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 9921834 is about 3149.8942839403. The cubic root of 9921834 is about 214.8806548751.

The spelling of 9921834 in words is "nine million, nine hundred twenty-one thousand, eight hundred thirty-four".