9120090 has 64 divisors (see below), whose sum is σ = 25277184. Its totient is φ = 2062848.

The previous prime is 9120079. The next prime is 9120091. The reversal of 9120090 is 900219.

9120090 = 428² + 429² + ... + 472².

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9120091) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 28612 + ... + 28928.

It is an arithmetic number, because the mean of its divisors is an integer number (394956).

Almost surely, 2^9120090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9120090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12638592).

9120090 is an abundant number, since it is smaller than the sum of its proper divisors (16157094).

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

9120090 is a wasteful number, since it uses less digits than its factorization.

9120090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 9120090 is about 3019.9486750606. The cubic root of 9120090 is about 208.9294726279.

The spelling of 9120090 in words is "nine million, one hundred twenty thousand, ninety".