138394198912 has 64 divisors (see below), whose sum is σ = 281959464960. Its totient is φ = 67644702720.

The previous prime is 138394198903. The next prime is 138394198919. The reversal of 138394198912 is 219891493831.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138394198919) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 990337 + ... + 1121407.

It is an arithmetic number, because the mean of its divisors is an integer number (4405616640).

Almost surely, 2^138394198912 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 138394198912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140979732480).

138394198912 is an abundant number, since it is smaller than the sum of its proper divisors (143565266048).

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

138394198912 is a wasteful number, since it uses less digits than its factorization.

138394198912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131271 (or 131259 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 58.

The spelling of 138394198912 in words is "one hundred thirty-eight billion, three hundred ninety-four million, one hundred ninety-eight thousand, nine hundred twelve".