9900990138 has 16 divisors (see below), whose sum is σ = 21325209696. Its totient is φ = 3046458480.

The previous prime is 9900990109. The next prime is 9900990139. The reversal of 9900990138 is 8310990099.

9900990138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9900990139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63467808 + ... + 63467963.

It is an arithmetic number, because the mean of its divisors is an integer number (1332825606).

Almost surely, 2^9900990138 is an apocalyptic number.

9900990138 is an abundant number, since it is smaller than the sum of its proper divisors (11424219558).

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

9900990138 is a wasteful number, since it uses less digits than its factorization.

9900990138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126935789.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 9900990138 is about 99503.7192169217. The cubic root of 9900990138 is about 2147.3007509153.

The spelling of 9900990138 in words is "nine billion, nine hundred million, nine hundred ninety thousand, one hundred thirty-eight".