9943640 has 64 divisors (see below), whose sum is σ = 27086400. Its totient is φ = 3207168.

The previous prime is 9943579. The next prime is 9943663. The reversal of 9943640 is 463499.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 9943640.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3716 + ... + 5804.

It is an arithmetic number, because the mean of its divisors is an integer number (423225).

Almost surely, 2^9943640 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 9943640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13543200).

9943640 is an abundant number, since it is smaller than the sum of its proper divisors (17142760).

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

9943640 is a wasteful number, since it uses less digits than its factorization.

9943640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124 (or 2120 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 9943640 is about 3153.3537701945. The cubic root of 9943640 is about 215.0379597659.

The spelling of 9943640 in words is "nine million, nine hundred forty-three thousand, six hundred forty".