138809708856 has 192 divisors, whose sum is σ = 477171475200. Its totient is φ = 36609086592.

The previous prime is 138809708747. The next prime is 138809708857. The reversal of 138809708856 is 658807908831.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 138809708793 and 138809708802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138809708857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16086 + ... + 527141.

It is an arithmetic number, because the mean of its divisors is an integer number (2485268100).

Almost surely, 2^138809708856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138809708856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238585737600).

138809708856 is an abundant number, since it is smaller than the sum of its proper divisors (338361766344).

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

138809708856 is a wasteful number, since it uses less digits than its factorization.

138809708856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543275 (or 543252 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 63.

The spelling of 138809708856 in words is "one hundred thirty-eight billion, eight hundred nine million, seven hundred eight thousand, eight hundred fifty-six".