9943820 has 24 divisors (see below), whose sum is σ = 21790944. Its totient is φ = 3804416.

The previous prime is 9943819. The next prime is 9943849. The reversal of 9943820 is 283499.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 10349 + ... + 11268.

It is an arithmetic number, because the mean of its divisors is an integer number (907956).

Almost surely, 2^9943820 is an apocalyptic number.

It is an amenable number.

9943820 is an abundant number, since it is smaller than the sum of its proper divisors (11847124).

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

9943820 is a wasteful number, since it uses less digits than its factorization.

9943820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21649 (or 21647 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 9943820 is about 3153.3823111066. The cubic root of 9943820 is about 215.0392572988.

The spelling of 9943820 in words is "nine million, nine hundred forty-three thousand, eight hundred twenty".