423445138 has 4 divisors (see below), whose sum is σ = 635167710. Its totient is φ = 211722568.

The previous prime is 423445097. The next prime is 423445147. The reversal of 423445138 is 831544324.

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

It can be written as a sum of positive squares in only one way, i.e., 395492769 + 27952369 = 19887^2 + 5287^2 .

It is an unprimeable number.

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, 105861283 + ... + 105861286.

Almost surely, 2^423445138 is an apocalyptic number.

423445138 is a deficient number, since it is larger than the sum of its proper divisors (211722572).

423445138 is a wasteful number, since it uses less digits than its factorization.

423445138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211722571.

The product of its digits is 46080, while the sum is 34.

The square root of 423445138 is about 20577.7826307890. The cubic root of 423445138 is about 750.9293002074.

The spelling of 423445138 in words is "four hundred twenty-three million, four hundred forty-five thousand, one hundred thirty-eight".