9903840 has 96 divisors (see below), whose sum is σ = 31933440. Its totient is φ = 2578944.

The previous prime is 9903821. The next prime is 9903847. The reversal of 9903840 is 483099.

9903840 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9903847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22341 + ... + 22779.

It is an arithmetic number, because the mean of its divisors is an integer number (332640).

Almost surely, 2^9903840 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 9903840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15966720).

9903840 is an abundant number, since it is smaller than the sum of its proper divisors (22029600).

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

9903840 is a wasteful number, since it uses less digits than its factorization.

9903840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 9903840 is about 3147.0367014066. The cubic root of 9903840 is about 214.7506754681.

The spelling of 9903840 in words is "nine million, nine hundred three thousand, eight hundred forty".