9909000 has 128 divisors (see below), whose sum is σ = 34444800. Its totient is φ = 2635200.

The previous prime is 9908957. The next prime is 9909001. The reversal of 9909000 is 9099.

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.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26817 + ... + 27183.

It is an arithmetic number, because the mean of its divisors is an integer number (269100).

Almost surely, 2^9909000 is an apocalyptic number.

9909000 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9909000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17222400).

9909000 is an abundant number, since it is smaller than the sum of its proper divisors (24535800).

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

9909000 is a wasteful number, since it uses less digits than its factorization.

9909000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 377 counting only the distinct ones).

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

The square root of 9909000 is about 3147.8564134979. The cubic root of 9909000 is about 214.7879647450.

The spelling of 9909000 in words is "nine million, nine hundred nine thousand".