2259809 has 4 divisors (see below), whose sum is σ = 2283204. Its totient is φ = 2236416.

The previous prime is 2259791. The next prime is 2259811. The reversal of 2259809 is 9089522.

2259809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 577600 + 1682209 = 760^2 + 1297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2259809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2259889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11552 + ... + 11745.

It is an arithmetic number, because the mean of its divisors is an integer number (570801).

2^2259809 is an apocalyptic number.

It is an amenable number.

2259809 is a deficient number, since it is larger than the sum of its proper divisors (23395).

2259809 is an equidigital number, since it uses as much as digits as its factorization.

2259809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23394.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 2259809 is about 1503.2661108400. The cubic root of 2259809 is about 131.2272147900.

The spelling of 2259809 in words is "two million, two hundred fifty-nine thousand, eight hundred nine".