138195729492 has 96 divisors (see below), whose sum is σ = 332976365568. Its totient is φ = 44576728704.

The previous prime is 138195729491. The next prime is 138195729521. The reversal of 138195729492 is 294927591831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138195729491) 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 31 ways as a sum of consecutive naturals, for example, 88190493 + ... + 88192059.

It is an arithmetic number, because the mean of its divisors is an integer number (3468503808).

Almost surely, 2^138195729492 is an apocalyptic number.

138195729492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138195729492 is an abundant number, since it is smaller than the sum of its proper divisors (194780636076).

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

138195729492 is a wasteful number, since it uses less digits than its factorization.

138195729492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565 (or 2563 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 60.

The spelling of 138195729492 in words is "one hundred thirty-eight billion, one hundred ninety-five million, seven hundred twenty-nine thousand, four hundred ninety-two".