2243665 has 4 divisors (see below), whose sum is σ = 2692404. Its totient is φ = 1794928.

The previous prime is 2243663. The next prime is 2243669. The reversal of 2243665 is 5663422.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1617984 + 625681 = 1272^2 + 791^2 .

It is a cyclic number.

It is not a de Polignac number, because 2243665 - 2¹ = 2243663 is a prime.

It is a Duffinian number.

2243665 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2243663) 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, 224362 + ... + 224371.

It is an arithmetic number, because the mean of its divisors is an integer number (673101).

2^2243665 is an apocalyptic number.

It is an amenable number.

2243665 is a deficient number, since it is larger than the sum of its proper divisors (448739).

2243665 is an equidigital number, since it uses as much as digits as its factorization.

2243665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448738.

The product of its digits is 8640, while the sum is 28.

The square root of 2243665 is about 1497.8868448584. The cubic root of 2243665 is about 130.9139733934.

Subtracting from 2243665 its product of digits (8640), we obtain a square (2235025 = 1495²).

The spelling of 2243665 in words is "two million, two hundred forty-three thousand, six hundred sixty-five".