138638415248 has 20 divisors (see below), whose sum is σ = 268623288780. Its totient is φ = 69316276224.

The previous prime is 138638415199. The next prime is 138638415257. The reversal of 138638415248 is 842514836831.

It can be written as a sum of positive squares in 2 ways, for example, as 71592634624 + 67045780624 = 267568^2 + 258932^2 .

It is a super-2 number, since 2×138638415248² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138638415248.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 236036 + ... + 577052.

It is an arithmetic number, because the mean of its divisors is an integer number (13431164439).

Almost surely, 2^138638415248 is an apocalyptic number.

It is an amenable number.

138638415248 is a deficient number, since it is larger than the sum of its proper divisors (129984873532).

138638415248 is a wasteful number, since it uses less digits than its factorization.

138638415248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366434 (or 366428 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 53.

The spelling of 138638415248 in words is "one hundred thirty-eight billion, six hundred thirty-eight million, four hundred fifteen thousand, two hundred forty-eight".