138799975424 has 88 divisors (see below), whose sum is σ = 305519957568. Its totient is φ = 62500720640.

The previous prime is 138799975423. The next prime is 138799975427. The reversal of 138799975424 is 424579997831.

It is a tau number, because it is divible by the number of its divisors (88).

It is not an unprimeable number, because it can be changed into a prime (138799975423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1147667 + ... + 1262829.

Almost surely, 2^138799975424 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 138799975424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152759978784).

138799975424 is an abundant number, since it is smaller than the sum of its proper divisors (166719982144).

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

138799975424 is a wasteful number, since it uses less digits than its factorization.

138799975424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115301 (or 115283 counting only the distinct ones).

The product of its digits is 137168640, while the sum is 68.

The spelling of 138799975424 in words is "one hundred thirty-eight billion, seven hundred ninety-nine million, nine hundred seventy-five thousand, four hundred twenty-four".