9939691242 has 96 divisors (see below), whose sum is σ = 23598521856. Its totient is φ = 3005164800.

The previous prime is 9939691193. The next prime is 9939691243. The reversal of 9939691242 is 2421969399.

9939691242 is a `hidden beast` number, since 9 + 9 + 396 + 9 + 1 + 242 = 666.

9939691242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (9939691243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5311567 + ... + 5313437.

It is an arithmetic number, because the mean of its divisors is an integer number (245817936).

Almost surely, 2^9939691242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9939691242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11799260928).

9939691242 is an abundant number, since it is smaller than the sum of its proper divisors (13658830614).

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

9939691242 is a wasteful number, since it uses less digits than its factorization.

9939691242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276 (or 2273 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 9939691242 is about 99698.0001905755. Note that the first 3 decimals coincide. The cubic root of 9939691242 is about 2150.0949114041.

The spelling of 9939691242 in words is "nine billion, nine hundred thirty-nine million, six hundred ninety-one thousand, two hundred forty-two".