9000990 has 128 divisors (see below), whose sum is σ = 26593920. Its totient is φ = 2156544.

The previous prime is 9000989. The next prime is 9000997. The reversal of 9000990 is 990009.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

9000990 is a modest number, since divided by 990 gives 900 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9000997) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 169804 + ... + 169856.

It is an arithmetic number, because the mean of its divisors is an integer number (207765).

Almost surely, 2^9000990 is an apocalyptic number.

9000990 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 9000990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13296960).

9000990 is an abundant number, since it is smaller than the sum of its proper divisors (17592930).

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

9000990 is a wasteful number, since it uses less digits than its factorization.

9000990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 27.

The square root of 9000990 is about 3000.1649954627. The cubic root of 9000990 is about 208.0160089996.

Adding to 9000990 its reverse (990009), we get a palindrome (9990999).

The spelling of 9000990 in words is "nine million, nine hundred ninety", and thus it is an aban number.