422309 has 2 divisors, whose sum is σ = 422310. Its totient is φ = 422308.

The previous prime is 422291. The next prime is 422311. The reversal of 422309 is 903224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390625 + 31684 = 625^2 + 178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-422309 is a prime.

It is a Sophie Germain prime.

Together with 422311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 422309.

It is not a weakly prime, because it can be changed into another prime (422339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211154 + 211155.

It is an arithmetic number, because the mean of its divisors is an integer number (211155).

2⁴²²³⁰⁹ is an apocalyptic number.

It is an amenable number.

422309 is a deficient number, since it is larger than the sum of its proper divisors (1).

422309 is an equidigital number, since it uses as much as digits as its factorization.

422309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 422309 is about 649.8530603144. The cubic root of 422309 is about 75.0257097043.

The spelling of 422309 in words is "four hundred twenty-two thousand, three hundred nine".