423646309 has 2 divisors, whose sum is σ = 423646310. Its totient is φ = 423646308.

The previous prime is 423646303. The next prime is 423646339. The reversal of 423646309 is 903646324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 405821025 + 17825284 = 20145^2 + 4222^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423646309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423646303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211823154 + 211823155.

It is an arithmetic number, because the mean of its divisors is an integer number (211823155).

Almost surely, 2^423646309 is an apocalyptic number.

It is an amenable number.

423646309 is a deficient number, since it is larger than the sum of its proper divisors (1).

423646309 is an equidigital number, since it uses as much as digits as its factorization.

423646309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 37.

The square root of 423646309 is about 20582.6701134717. The cubic root of 423646309 is about 751.0481989487.

The spelling of 423646309 in words is "four hundred twenty-three million, six hundred forty-six thousand, three hundred nine".