423308309 has 2 divisors, whose sum is σ = 423308310. Its totient is φ = 423308308.

The previous prime is 423308299. The next prime is 423308311. The reversal of 423308309 is 903803324.

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., 385140625 + 38167684 = 19625^2 + 6178^2 .

It is a cyclic number.

It is not a de Polignac number, because 423308309 - 2⁴ = 423308293 is a prime.

It is a Sophie Germain prime.

Together with 423308311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423308339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211654154 + 211654155.

It is an arithmetic number, because the mean of its divisors is an integer number (211654155).

Almost surely, 2^423308309 is an apocalyptic number.

It is an amenable number.

423308309 is a deficient number, since it is larger than the sum of its proper divisors (1).

423308309 is an equidigital number, since it uses as much as digits as its factorization.

423308309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 423308309 is about 20574.4576842258. The cubic root of 423308309 is about 750.8484082058.

The spelling of 423308309 in words is "four hundred twenty-three million, three hundred eight thousand, three hundred nine".