9990988 has 12 divisors (see below), whose sum is σ = 19982032. Its totient is φ = 4281840.

The previous prime is 9990961. The next prime is 9990989. The reversal of 9990988 is 8890999.

9990988 is an admirable number.

It is a super-2 number, since 2×9990988² = 199639682432288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9990989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178383 + ... + 178438.

Almost surely, 2^9990988 is an apocalyptic number.

It is an amenable number.

9990988 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.

9990988 is a wasteful number, since it uses less digits than its factorization.

9990988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356832 (or 356830 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 9990988 is about 3160.8524166750. The cubic root of 9990988 is about 215.3787303337.

The spelling of 9990988 in words is "nine million, nine hundred ninety thousand, nine hundred eighty-eight".