9999090 has 48 divisors (see below), whose sum is σ = 26162136. Its totient is φ = 2649600.

The previous prime is 9999083. The next prime is 9999161. The reversal of 9999090 is 909999.

It can be written as a sum of positive squares in 4 ways, for example, as 8311689 + 1687401 = 2883^2 + 1299^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21460 + ... + 21920.

Almost surely, 2^9999090 is an apocalyptic number.

9999090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

9999090 is an abundant number, since it is smaller than the sum of its proper divisors (16163046).

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

9999090 is a wasteful number, since it uses less digits than its factorization.

9999090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 712 counting only the distinct ones).

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

The square root of 9999090 is about 3162.1337732613. The cubic root of 9999090 is about 215.4369336864.

The spelling of 9999090 in words is "nine million, nine hundred ninety-nine thousand, ninety".