138923526 has 48 divisors (see below), whose sum is σ = 327687984. Its totient is φ = 39142656.

The previous prime is 138923513. The next prime is 138923549. The reversal of 138923526 is 625329831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18226 + ... + 24698.

It is an arithmetic number, because the mean of its divisors is an integer number (6826833).

Almost surely, 2^138923526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138923526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163843992).

138923526 is an abundant number, since it is smaller than the sum of its proper divisors (188764458).

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

138923526 is a wasteful number, since it uses less digits than its factorization.

138923526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6565 (or 6558 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 138923526 is about 11786.5824563357. The cubic root of 138923526 is about 517.9151309704.

The spelling of 138923526 in words is "one hundred thirty-eight million, nine hundred twenty-three thousand, five hundred twenty-six".