420436609 has 2 divisors, whose sum is σ = 420436610. Its totient is φ = 420436608.

The previous prime is 420436607. The next prime is 420436613. The reversal of 420436609 is 906634024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315169009 + 105267600 = 17753^2 + 10260^2 .

It is a cyclic number.

It is not a de Polignac number, because 420436609 - 2¹ = 420436607 is a prime.

Together with 420436607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (420436603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210218304 + 210218305.

It is an arithmetic number, because the mean of its divisors is an integer number (210218305).

Almost surely, 2^420436609 is an apocalyptic number.

It is an amenable number.

420436609 is a deficient number, since it is larger than the sum of its proper divisors (1).

420436609 is an equidigital number, since it uses as much as digits as its factorization.

420436609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 420436609 is about 20504.5509338781. The cubic root of 420436609 is about 749.1466495738.

The spelling of 420436609 in words is "four hundred twenty million, four hundred thirty-six thousand, six hundred nine".