9021440 has 48 divisors (see below), whose sum is σ = 21670740. Its totient is φ = 3604480.

The previous prime is 9021433. The next prime is 9021449. The reversal of 9021440 is 441209.

9021440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8479744 + 541696 = 2912^2 + 736^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (9021449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9800 + ... + 10680.

Almost surely, 2^9021440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9021440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10835370).

9021440 is an abundant number, since it is smaller than the sum of its proper divisors (12649300).

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

9021440 is an equidigital number, since it uses as much as digits as its factorization.

9021440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908 (or 888 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 9021440 is about 3003.5712077459. The cubic root of 9021440 is about 208.1734253816.

Adding to 9021440 its reverse (441209), we get a palindrome (9462649).

The spelling of 9021440 in words is "nine million, twenty-one thousand, four hundred forty".