638119971 has 16 divisors (see below), whose sum is σ = 946437120. Its totient is φ = 424929960.

The previous prime is 638119907. The next prime is 638120017. The reversal of 638119971 is 179911836.

638119971 is a `hidden beast` number, since 638 + 1 + 1 + 9 + 9 + 7 + 1 = 666.

It is not a de Polignac number, because 638119971 - 2⁶ = 638119907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638119901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11626 + ... + 37568.

It is an arithmetic number, because the mean of its divisors is an integer number (59152320).

Almost surely, 2^638119971 is an apocalyptic number.

638119971 is a deficient number, since it is larger than the sum of its proper divisors (308317149).

638119971 is a wasteful number, since it uses less digits than its factorization.

638119971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26863 (or 26857 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 638119971 is about 25261.0366176846. The cubic root of 638119971 is about 860.9292151255.

The spelling of 638119971 in words is "six hundred thirty-eight million, one hundred nineteen thousand, nine hundred seventy-one".