138159394000 has 80 divisors (see below), whose sum is σ = 334671878736. Its totient is φ = 55164096000.

The previous prime is 138159393971. The next prime is 138159394001. The reversal of 138159394000 is 493951831.

It can be written as a sum of positive squares in 8 ways, for example, as 39749194384 + 98410199616 = 199372^2 + 313704^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138159394001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1051990 + ... + 1176010.

Almost surely, 2^138159394000 is an apocalyptic number.

138159394000 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 138159394000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167335939368).

138159394000 is an abundant number, since it is smaller than the sum of its proper divisors (196512484736).

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

138159394000 is a wasteful number, since it uses less digits than its factorization.

138159394000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124601 (or 124585 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 138159394000 in words is "one hundred thirty-eight billion, one hundred fifty-nine million, three hundred ninety-four thousand".