9856638 has 48 divisors (see below), whose sum is σ = 23677056. Its totient is φ = 2938320.

The previous prime is 9856633. The next prime is 9856697. The reversal of 9856638 is 8366589.

9856638 is a `hidden beast` number, since 9 + 8 + 5 + 6 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 9856593 and 9856602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9856633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12895 + ... + 13637.

It is an arithmetic number, because the mean of its divisors is an integer number (493272).

Almost surely, 2^9856638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9856638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11838528).

9856638 is an abundant number, since it is smaller than the sum of its proper divisors (13820418).

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

9856638 is a wasteful number, since it uses less digits than its factorization.

9856638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 826 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 9856638 is about 3139.5283085202. The cubic root of 9856638 is about 214.4089626228.

The spelling of 9856638 in words is "nine million, eight hundred fifty-six thousand, six hundred thirty-eight".