638434233 has 6 divisors (see below), whose sum is σ = 922182794. Its totient is φ = 425622816.

The previous prime is 638434193. The next prime is 638434249. The reversal of 638434233 is 332434836.

It can be written as a sum of positive squares in only one way, i.e., 606489129 + 31945104 = 24627^2 + 5652^2 .

It is not a de Polignac number, because 638434233 - 2⁶ = 638434169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638434283) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 35468560 + ... + 35468577.

Almost surely, 2^638434233 is an apocalyptic number.

It is an amenable number.

638434233 is a deficient number, since it is larger than the sum of its proper divisors (283748561).

638434233 is a wasteful number, since it uses less digits than its factorization.

638434233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70937143 (or 70937140 counting only the distinct ones).

The product of its digits is 124416, while the sum is 36.

The square root of 638434233 is about 25267.2561430797. The cubic root of 638434233 is about 861.0705223753.

The spelling of 638434233 in words is "six hundred thirty-eight million, four hundred thirty-four thousand, two hundred thirty-three".