138931061960 has 64 divisors (see below), whose sum is σ = 324300672000. Its totient is φ = 53509420800.

The previous prime is 138931061959. The next prime is 138931061963. The reversal of 138931061960 is 69160139831.

It is a happy number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (138931061963) 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 15 ways as a sum of consecutive naturals, for example, 34751 + ... + 528270.

It is an arithmetic number, because the mean of its divisors is an integer number (5067198000).

Almost surely, 2^138931061960 is an apocalyptic number.

138931061960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138931061960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162150336000).

138931061960 is an abundant number, since it is smaller than the sum of its proper divisors (185369610040).

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

138931061960 is a wasteful number, since it uses less digits than its factorization.

138931061960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563262 (or 563258 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 138931061960 in words is "one hundred thirty-eight billion, nine hundred thirty-one million, sixty-one thousand, nine hundred sixty".