9990042 has 8 divisors (see below), whose sum is σ = 19980096. Its totient is φ = 3330012.

The previous prime is 9990017. The next prime is 9990047. The reversal of 9990042 is 2400999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

9990042 is an admirable number.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 9989985 and 9990012.

It is not an unprimeable number, because it can be changed into a prime (9990047) 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 3 ways as a sum of consecutive naturals, for example, 832498 + ... + 832509.

It is an arithmetic number, because the mean of its divisors is an integer number (2497512).

Almost surely, 2^9990042 is an apocalyptic number.

9990042 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

9990042 is a wasteful number, since it uses less digits than its factorization.

9990042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665012.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 9990042 is about 3160.7027699548. The cubic root of 9990042 is about 215.3719323837.

The spelling of 9990042 in words is "nine million, nine hundred ninety thousand, forty-two".