9009990 has 96 divisors (see below), whose sum is σ = 26956800. Its totient is φ = 2064960.

The previous prime is 9009989. The next prime is 9009991. The reversal of 9009990 is 999009.

9009990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9009989) and next prime (9009991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9009991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18571 + ... + 19049.

It is an arithmetic number, because the mean of its divisors is an integer number (280800).

Almost surely, 2^9009990 is an apocalyptic number.

9009990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9009990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13478400).

9009990 is an abundant number, since it is smaller than the sum of its proper divisors (17946810).

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

9009990 is a wasteful number, since it uses less digits than its factorization.

9009990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 36.

The square root of 9009990 is about 3001.6645382188. The cubic root of 9009990 is about 208.0853169478.

It can be divided in two parts, 9009 and 990, that added together give a palindrome (9999).

The spelling of 9009990 in words is "nine million, nine thousand, nine hundred ninety".