138519251838 has 48 divisors (see below), whose sum is σ = 332020570752. Its totient is φ = 41384322000.

The previous prime is 138519251797. The next prime is 138519251861. The reversal of 138519251838 is 838152915831.

138519251838 is a `hidden beast` number, since 1 + 3 + 8 + 5 + 1 + 92 + 518 + 38 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4912648 + ... + 4940763.

It is an arithmetic number, because the mean of its divisors is an integer number (6917095224).

Almost surely, 2^138519251838 is an apocalyptic number.

138519251838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138519251838 is an abundant number, since it is smaller than the sum of its proper divisors (193501318914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138519251838 is a wasteful number, since it uses less digits than its factorization.

138519251838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9853501 (or 9853498 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 54.

The spelling of 138519251838 in words is "one hundred thirty-eight billion, five hundred nineteen million, two hundred fifty-one thousand, eight hundred thirty-eight".