2205409 has 2 divisors, whose sum is σ = 2205410. Its totient is φ = 2205408.

The previous prime is 2205389. The next prime is 2205449. The reversal of 2205409 is 9045022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 567009 = 1280^2 + 753^2 .

It is a cyclic number.

It is not a de Polignac number, because 2205409 - 2¹¹ = 2203361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2205409.

It is not a weakly prime, because it can be changed into another prime (2205449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1102704 + 1102705.

It is an arithmetic number, because the mean of its divisors is an integer number (1102705).

2^2205409 is an apocalyptic number.

It is an amenable number.

2205409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2205409 is an equidigital number, since it uses as much as digits as its factorization.

2205409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 2205409 is about 1485.0619515697. The cubic root of 2205409 is about 130.1656468303.

The spelling of 2205409 in words is "two million, two hundred five thousand, four hundred nine".