2243840 has 36 divisors (see below), whose sum is σ = 5377764. Its totient is φ = 897024.

The previous prime is 2243833. The next prime is 2243851. The reversal of 2243840 is 483422.

It can be written as a sum of positive squares in 2 ways, for example, as 350464 + 1893376 = 592^2 + 1376^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404 + ... + 2156.

2^2243840 is an apocalyptic number.

2243840 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 2243840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2688882).

2243840 is an abundant number, since it is smaller than the sum of its proper divisors (3133924).

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

2243840 is an equidigital number, since it uses as much as digits as its factorization.

2243840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774 (or 1760 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 2243840 is about 1497.9452593469. The cubic root of 2243840 is about 130.9173769540.

The spelling of 2243840 in words is "two million, two hundred forty-three thousand, eight hundred forty".