638483139 has 12 divisors (see below), whose sum is σ = 1054004016. Its totient is φ = 364847472.

The previous prime is 638483129. The next prime is 638483141. The reversal of 638483139 is 931384836.

638483139 is a `hidden beast` number, since 6 + 38 + 483 + 139 = 666.

638483139 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 638483139 - 2¹² = 638479043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638483094 and 638483103.

It is not an unprimeable number, because it can be changed into a prime (638483129) 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, 5067264 + ... + 5067389.

It is an arithmetic number, because the mean of its divisors is an integer number (87833668).

Almost surely, 2^638483139 is an apocalyptic number.

638483139 is a deficient number, since it is larger than the sum of its proper divisors (415520877).

638483139 is a wasteful number, since it uses less digits than its factorization.

638483139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10134666 (or 10134663 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 638483139 is about 25268.2238988022. The cubic root of 638483139 is about 861.0925086857.

The spelling of 638483139 in words is "six hundred thirty-eight million, four hundred eighty-three thousand, one hundred thirty-nine".