2259209 has 4 divisors (see below), whose sum is σ = 2279316. Its totient is φ = 2239104.

The previous prime is 2259199. The next prime is 2259211. The reversal of 2259209 is 9029522.

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 529984 + 1729225 = 728^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 2259209 - 2⁸ = 2258953 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 (2259239) 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, 9884 + ... + 10109.

It is an arithmetic number, because the mean of its divisors is an integer number (569829).

2^2259209 is an apocalyptic number.

It is an amenable number.

2259209 is a deficient number, since it is larger than the sum of its proper divisors (20107).

2259209 is a wasteful number, since it uses less digits than its factorization.

2259209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20106.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 2259209 is about 1503.0665321269. The cubic root of 2259209 is about 131.2155997525.

The spelling of 2259209 in words is "two million, two hundred fifty-nine thousand, two hundred nine".