638271239 has 12 divisors (see below), whose sum is σ = 679513800. Its totient is φ = 599407488.

The previous prime is 638271203. The next prime is 638271301. The reversal of 638271239 is 932172836.

638271239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638271239 - 2¹⁶ = 638205703 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 638271196 and 638271205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638271539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144932 + ... + 149270.

It is an arithmetic number, because the mean of its divisors is an integer number (56626150).

Almost surely, 2^638271239 is an apocalyptic number.

638271239 is a deficient number, since it is larger than the sum of its proper divisors (41242561).

638271239 is a wasteful number, since it uses less digits than its factorization.

638271239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4882 (or 4865 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 638271239 is about 25264.0305375053. The cubic root of 638271239 is about 860.9972382545.

The spelling of 638271239 in words is "six hundred thirty-eight million, two hundred seventy-one thousand, two hundred thirty-nine".