9090990 has 48 divisors (see below), whose sum is σ = 23941008. Its totient is φ = 2393088.

The previous prime is 9090989. The next prime is 9091009. The reversal of 9090990 is 990909.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6862 + ... + 8078.

It is an arithmetic number, because the mean of its divisors is an integer number (498771).

Almost surely, 2^9090990 is an apocalyptic number.

9090990 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 9090990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11970504).

9090990 is an abundant number, since it is smaller than the sum of its proper divisors (14850018).

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

9090990 is a wasteful number, since it uses less digits than its factorization.

9090990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313 (or 1310 counting only the distinct ones).

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

The square root of 9090990 is about 3015.1268630026. The cubic root of 9090990 is about 208.7070214028.

The spelling of 9090990 in words is "nine million, ninety thousand, nine hundred ninety".