2238809 has 2 divisors, whose sum is σ = 2238810. Its totient is φ = 2238808.

The previous prime is 2238799. The next prime is 2238811. The reversal of 2238809 is 9088322.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1968409 + 270400 = 1403^2 + 520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2238809 is a prime.

It is a Sophie Germain prime.

Together with 2238811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2238109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1119404 + 1119405.

It is an arithmetic number, because the mean of its divisors is an integer number (1119405).

2^2238809 is an apocalyptic number.

It is an amenable number.

2238809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2238809 is an equidigital number, since it uses as much as digits as its factorization.

2238809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 2238809 is about 1496.2650166331. The cubic root of 2238809 is about 130.8194587727.

The spelling of 2238809 in words is "two million, two hundred thirty-eight thousand, eight hundred nine".