9897822 has 64 divisors (see below), whose sum is σ = 25286400. Its totient is φ = 2838240.

The previous prime is 9897809. The next prime is 9897829. The reversal of 9897822 is 2287989.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9897829) 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 31 ways as a sum of consecutive naturals, for example, 10848 + ... + 11724.

It is an arithmetic number, because the mean of its divisors is an integer number (395100).

Almost surely, 2^9897822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9897822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12643200).

9897822 is an abundant number, since it is smaller than the sum of its proper divisors (15388578).

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

9897822 is a wasteful number, since it uses less digits than its factorization.

9897822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 912 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 9897822 is about 3146.0804185526. The cubic root of 9897822 is about 214.7071693998.

The spelling of 9897822 in words is "nine million, eight hundred ninety-seven thousand, eight hundred twenty-two".