138235751948 has 96 divisors (see below), whose sum is σ = 303790556160. Its totient is φ = 53713186560.

The previous prime is 138235751939. The next prime is 138235751999. The reversal of 138235751948 is 849157532831.

It is a junction number, because it is equal to n+sod(n) for n = 138235751893 and 138235751902.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1143161 + ... + 1258287.

It is an arithmetic number, because the mean of its divisors is an integer number (3164484960).

Almost surely, 2^138235751948 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 138235751948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151895278080).

138235751948 is an abundant number, since it is smaller than the sum of its proper divisors (165554804212).

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

138235751948 is a wasteful number, since it uses less digits than its factorization.

138235751948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115255 (or 115253 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 56.

The spelling of 138235751948 in words is "one hundred thirty-eight billion, two hundred thirty-five million, seven hundred fifty-one thousand, nine hundred forty-eight".