9991438030 has 16 divisors (see below), whose sum is σ = 20553815520. Its totient is φ = 3425635872.

The previous prime is 9991438007. The next prime is 9991438031. The reversal of 9991438030 is 308341999.

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, 71367345 + ... + 71367484.

It is an arithmetic number, because the mean of its divisors is an integer number (1284613470).

Almost surely, 2^9991438030 is an apocalyptic number.

9991438030 is an abundant number, since it is smaller than the sum of its proper divisors (10562377490).

9991438030 is a wasteful number, since it uses less digits than its factorization.

9991438030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142734843.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 9991438030 is about 99957.1809826588. The cubic root of 9991438030 is about 2153.8196409580.

The spelling of 9991438030 in words is "nine billion, nine hundred ninety-one million, four hundred thirty-eight thousand, thirty".