423446509 has 4 divisors (see below), whose sum is σ = 423519516. Its totient is φ = 423373504.

The previous prime is 423446497. The next prime is 423446519. The reversal of 423446509 is 905644324.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63282025 + 360164484 = 7955^2 + 18978^2 .

It is a cyclic number.

It is not a de Polignac number, because 423446509 - 2²⁷ = 289228781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423446519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26974 + ... + 39679.

It is an arithmetic number, because the mean of its divisors is an integer number (105879879).

Almost surely, 2^423446509 is an apocalyptic number.

It is an amenable number.

423446509 is a deficient number, since it is larger than the sum of its proper divisors (73007).

423446509 is an equidigital number, since it uses as much as digits as its factorization.

423446509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73006.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 423446509 is about 20577.8159433891. The cubic root of 423446509 is about 750.9301106414.

The spelling of 423446509 in words is "four hundred twenty-three million, four hundred forty-six thousand, five hundred nine".