2243999 has 4 divisors (see below), whose sum is σ = 2247840. Its totient is φ = 2240160.

The previous prime is 2243987. The next prime is 2244091. The reversal of 2243999 is 9993422.

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

It is a cyclic number.

It is not a de Polignac number, because 2243999 - 2⁸ = 2243743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2243909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842 + ... + 2279.

It is an arithmetic number, because the mean of its divisors is an integer number (561960).

2^2243999 is an apocalyptic number.

2243999 is a deficient number, since it is larger than the sum of its proper divisors (3841).

2243999 is an equidigital number, since it uses as much as digits as its factorization.

2243999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840.

The product of its digits is 34992, while the sum is 38.

The square root of 2243999 is about 1497.9983311072. The cubic root of 2243999 is about 130.9204691785.

The spelling of 2243999 in words is "two million, two hundred forty-three thousand, nine hundred ninety-nine".