9991438104 has 32 divisors (see below), whose sum is σ = 24981560640. Its totient is φ = 3330084000.

The previous prime is 9991438103. The next prime is 9991438139. The reversal of 9991438104 is 4018341999.

It is a super-2 number, since 2×9991438104² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991438103) 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, 239179 + ... + 277829.

It is an arithmetic number, because the mean of its divisors is an integer number (780673770).

Almost surely, 2^9991438104 is an apocalyptic number.

It is an amenable number.

9991438104 is an abundant number, since it is smaller than the sum of its proper divisors (14990122536).

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

9991438104 is a wasteful number, since it uses less digits than its factorization.

9991438104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49431 (or 49427 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 9991438104 is about 99957.1813528173. The cubic root of 9991438104 is about 2153.8196462753.

The spelling of 9991438104 in words is "nine billion, nine hundred ninety-one million, four hundred thirty-eight thousand, one hundred four".