9934721940 has 144 divisors (see below), whose sum is σ = 32928263424. Its totient is φ = 2223133440.

The previous prime is 9934721917. The next prime is 9934721947. The reversal of 9934721940 is 491274399.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 9934721940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9934721947) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41749 + ... + 147011.

It is an arithmetic number, because the mean of its divisors is an integer number (228668496).

Almost surely, 2^9934721940 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 9934721940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16464131712).

9934721940 is an abundant number, since it is smaller than the sum of its proper divisors (22993541484).

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

9934721940 is a wasteful number, since it uses less digits than its factorization.

9934721940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105310 (or 105297 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 9934721940 is about 99673.0753012066. The cubic root of 9934721940 is about 2149.7365417214.

The spelling of 9934721940 in words is "nine billion, nine hundred thirty-four million, seven hundred twenty-one thousand, nine hundred forty".