2243440 has 40 divisors (see below), whose sum is σ = 5401440. Its totient is φ = 865536.

The previous prime is 2243431. The next prime is 2243453. The reversal of 2243440 is 443422.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1837 + ... + 2803.

It is an arithmetic number, because the mean of its divisors is an integer number (135036).

2^2243440 is an apocalyptic number.

2243440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2243440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2700720).

2243440 is an abundant number, since it is smaller than the sum of its proper divisors (3158000).

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

2243440 is a wasteful number, since it uses less digits than its factorization.

2243440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 1003 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 2243440 is about 1497.8117371686. The cubic root of 2243440 is about 130.9095971267.

Adding to 2243440 its reverse (443422), we get a palindrome (2686862).

The spelling of 2243440 in words is "two million, two hundred forty-three thousand, four hundred forty".