9991438032 has 40 divisors (see below), whose sum is σ = 26411481184. Its totient is φ = 3253025664.

The previous prime is 9991438031. The next prime is 9991438103. The reversal of 9991438032 is 2308341999.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991438031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2418343 + ... + 2422470.

Almost surely, 2^9991438032 is an apocalyptic number.

It is an amenable number.

9991438032 is an abundant number, since it is smaller than the sum of its proper divisors (16420043152).

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

9991438032 is a wasteful number, since it uses less digits than its factorization.

9991438032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4840867 (or 4840861 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 9991438032 is about 99957.1809926631. The cubic root of 9991438032 is about 2153.8196411017.

The spelling of 9991438032 in words is "nine billion, nine hundred ninety-one million, four hundred thirty-eight thousand, thirty-two".