138849505788 has 192 divisors, whose sum is σ = 389306953728. Its totient is φ = 37696389120.

The previous prime is 138849505783. The next prime is 138849505811. The reversal of 138849505788 is 887505948831.

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138849505783) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20293248 + ... + 20300088.

It is an arithmetic number, because the mean of its divisors is an integer number (2027640384).

Almost surely, 2^138849505788 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 138849505788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194653476864).

138849505788 is an abundant number, since it is smaller than the sum of its proper divisors (250457447940).

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

138849505788 is a wasteful number, since it uses less digits than its factorization.

138849505788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7052 (or 7050 counting only the distinct ones).

The product of its (nonzero) digits is 77414400, while the sum is 66.

The spelling of 138849505788 in words is "one hundred thirty-eight billion, eight hundred forty-nine million, five hundred five thousand, seven hundred eighty-eight".