9991240432 has 20 divisors (see below), whose sum is σ = 19367901000. Its totient is φ = 4993072448.

The previous prime is 9991240423. The next prime is 9991240433. The reversal of 9991240432 is 2340421999.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991240433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126682 + ... + 189817.

It is an arithmetic number, because the mean of its divisors is an integer number (968395050).

Almost surely, 2^9991240432 is an apocalyptic number.

It is an amenable number.

9991240432 is a deficient number, since it is larger than the sum of its proper divisors (9376660568).

9991240432 is a wasteful number, since it uses less digits than its factorization.

9991240432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318480 (or 318474 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 9991240432 is about 99956.1925645430. The cubic root of 9991240432 is about 2153.8054423592.

The spelling of 9991240432 in words is "nine billion, nine hundred ninety-one million, two hundred forty thousand, four hundred thirty-two".