9966840 has 64 divisors (see below), whose sum is σ = 32205600. Its totient is φ = 2452992.

The previous prime is 9966829. The next prime is 9966857. The reversal of 9966840 is 486699.

It is a junction number, because it is equal to n+sod(n) for n = 9966792 and 9966801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1635 + ... + 4754.

Almost surely, 2^9966840 is an apocalyptic number.

It is an amenable number.

9966840 is an abundant number, since it is smaller than the sum of its proper divisors (22238760).

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

9966840 is a wasteful number, since it uses less digits than its factorization.

9966840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6416 (or 6412 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 9966840 is about 3157.0302500926. The cubic root of 9966840 is about 215.2050684489.

The spelling of 9966840 in words is "nine million, nine hundred sixty-six thousand, eight hundred forty".