9099990 has 24 divisors (see below), whose sum is σ = 23660208. Its totient is φ = 2426640.

The previous prime is 9099989. The next prime is 9100009. The reversal of 9099990 is 999909.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50466 + ... + 50645.

It is an arithmetic number, because the mean of its divisors is an integer number (985842).

Almost surely, 2^9099990 is an apocalyptic number.

9099990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

9099990 is an abundant number, since it is smaller than the sum of its proper divisors (14560218).

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

9099990 is a wasteful number, since it uses less digits than its factorization.

9099990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101124 (or 101121 counting only the distinct ones).

The product of its (nonzero) digits is 59049, while the sum is 45.

The square root of 9099990 is about 3016.6189683154. The cubic root of 9099990 is about 208.7758713916.

The spelling of 9099990 in words is "nine million, ninety-nine thousand, nine hundred ninety".