9997866 has 48 divisors (see below), whose sum is σ = 22744800. Its totient is φ = 3169824.

The previous prime is 9997859. The next prime is 9997873. The reversal of 9997866 is 6687999.

It is an interprime number because it is at equal distance from previous prime (9997859) and next prime (9997873).

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, 55765 + ... + 55943.

It is an arithmetic number, because the mean of its divisors is an integer number (473850).

Almost surely, 2^9997866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9997866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11372400).

9997866 is an abundant number, since it is smaller than the sum of its proper divisors (12746934).

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

9997866 is a wasteful number, since it uses less digits than its factorization.

9997866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 320 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 9997866 is about 3161.9402271390. The cubic root of 9997866 is about 215.4281427008.

The spelling of 9997866 in words is "nine million, nine hundred ninety-seven thousand, eight hundred sixty-six".