9900000042 has 32 divisors (see below), whose sum is σ = 19857611904. Its totient is φ = 3290414400.

The previous prime is 9900000029. The next prime is 9900000043. The reversal of 9900000042 is 2400000099.

It is a junction number, because it is equal to n+sod(n) for n = 9899999958 and 9900000021.

It is not an unprimeable number, because it can be changed into a prime (9900000043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4227792 + ... + 4230132.

It is an arithmetic number, because the mean of its divisors is an integer number (620550372).

Almost surely, 2^9900000042 is an apocalyptic number.

9900000042 is an abundant number, since it is smaller than the sum of its proper divisors (9957611862).

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

9900000042 is a wasteful number, since it uses less digits than its factorization.

9900000042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4094.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 9900000042 is about 99498.7439217199. The cubic root of 9900000042 is about 2147.2291720554.

The spelling of 9900000042 in words is "nine billion, nine hundred million, forty-two", and thus it is an aban number.