9991938132 has 72 divisors (see below), whose sum is σ = 27585903072. Its totient is φ = 3024302400.

The previous prime is 9991938119. The next prime is 9991938179. The reversal of 9991938132 is 2318391999.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

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 23 ways as a sum of consecutive naturals, for example, 332907 + ... + 361677.

Almost surely, 2^9991938132 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 9991938132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13792951536).

9991938132 is an abundant number, since it is smaller than the sum of its proper divisors (17593964940).

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

9991938132 is a wasteful number, since it uses less digits than its factorization.

9991938132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29669 (or 29664 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 9991938132 is about 99959.6825325091. The cubic root of 9991938132 is about 2153.8555754430.

The spelling of 9991938132 in words is "nine billion, nine hundred ninety-one million, nine hundred thirty-eight thousand, one hundred thirty-two".