2238209 has 2 divisors, whose sum is σ = 2238210. Its totient is φ = 2238208.

The previous prime is 2238179. The next prime is 2238211. The reversal of 2238209 is 9028322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2093809 + 144400 = 1447^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 2238209 - 2¹⁶ = 2172673 is a prime.

Together with 2238211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2238239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1119104 + 1119105.

It is an arithmetic number, because the mean of its divisors is an integer number (1119105).

2^2238209 is an apocalyptic number.

It is an amenable number.

2238209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2238209 is an equidigital number, since it uses as much as digits as its factorization.

2238209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2238209 is about 1496.0645039570. The cubic root of 2238209 is about 130.8077712061.

The spelling of 2238209 in words is "two million, two hundred thirty-eight thousand, two hundred nine".