423508638 has 16 divisors (see below), whose sum is σ = 968019840. Its totient is φ = 121002456.

The previous prime is 423508621. The next prime is 423508661. The reversal of 423508638 is 836805324.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 423508596 and 423508605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5041728 + ... + 5041811.

It is an arithmetic number, because the mean of its divisors is an integer number (60501240).

Almost surely, 2^423508638 is an apocalyptic number.

423508638 is an abundant number, since it is smaller than the sum of its proper divisors (544511202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

423508638 is a wasteful number, since it uses less digits than its factorization.

423508638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10083551.

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 423508638 is about 20579.3254991508. The cubic root of 423508638 is about 750.9668348826.

The spelling of 423508638 in words is "four hundred twenty-three million, five hundred eight thousand, six hundred thirty-eight".