2259805 has 4 divisors (see below), whose sum is σ = 2711772. Its totient is φ = 1807840.

The previous prime is 2259791. The next prime is 2259811. The reversal of 2259805 is 5089522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5089522 = 2 ⋅2544761.

It can be written as a sum of positive squares in 2 ways, for example, as 480249 + 1779556 = 693^2 + 1334^2 .

It is not a de Polignac number, because 2259805 - 2⁹ = 2259293 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 225976 + ... + 225985.

It is an arithmetic number, because the mean of its divisors is an integer number (677943).

2^2259805 is an apocalyptic number.

It is an amenable number.

2259805 is a deficient number, since it is larger than the sum of its proper divisors (451967).

2259805 is an equidigital number, since it uses as much as digits as its factorization.

2259805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451966.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 2259805 is about 1503.2647804030. The cubic root of 2259805 is about 131.2271373632.

The spelling of 2259805 in words is "two million, two hundred fifty-nine thousand, eight hundred five".