9971856 has 80 divisors (see below), whose sum is σ = 29373120. Its totient is φ = 3237120.

The previous prime is 9971839. The next prime is 9971861. The reversal of 9971856 is 6581799.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17431 + ... + 17993.

It is an arithmetic number, because the mean of its divisors is an integer number (367164).

Almost surely, 2^9971856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9971856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14686560).

9971856 is an abundant number, since it is smaller than the sum of its proper divisors (19401264).

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

9971856 is a wasteful number, since it uses less digits than its factorization.

9971856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621 (or 609 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 9971856 is about 3157.8245676415. The cubic root of 9971856 is about 215.2411643959.

The spelling of 9971856 in words is "nine million, nine hundred seventy-one thousand, eight hundred fifty-six".