2243640 has 64 divisors (see below), whose sum is σ = 7695360. Its totient is φ = 512640.

The previous prime is 2243623. The next prime is 2243663. The reversal of 2243640 is 463422.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 496 + ... + 2175.

It is an arithmetic number, because the mean of its divisors is an integer number (120240).

2^2243640 is an apocalyptic number.

2243640 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 2243640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3847680).

2243640 is an abundant number, since it is smaller than the sum of its proper divisors (5451720).

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

2243640 is a wasteful number, since it uses less digits than its factorization.

2243640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692 (or 2688 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 2243640 is about 1497.8784997456. The cubic root of 2243640 is about 130.9134871560.

The spelling of 2243640 in words is "two million, two hundred forty-three thousand, six hundred forty".