423138609 has 12 divisors (see below), whose sum is σ = 611379652. Its totient is φ = 282009600.

The previous prime is 423138601. The next prime is 423138631. The reversal of 423138609 is 906831324.

423138609 is a `hidden beast` number, since 42 + 3 + 1 + 3 + 8 + 609 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 162639009 + 260499600 = 12753^2 + 16140^2 .

It is not a de Polignac number, because 423138609 - 2³ = 423138601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (423138601) 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 in 11 ways as a sum of consecutive naturals, for example, 51249 + ... + 58929.

Almost surely, 2^423138609 is an apocalyptic number.

It is an amenable number.

423138609 is a deficient number, since it is larger than the sum of its proper divisors (188241043).

423138609 is a wasteful number, since it uses less digits than its factorization.

423138609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13808 (or 13805 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 423138609 is about 20570.3332253029. Note that the first 3 decimals coincide. The cubic root of 423138609 is about 750.7480589623.

The spelling of 423138609 in words is "four hundred twenty-three million, one hundred thirty-eight thousand, six hundred nine".