138888156 has 72 divisors (see below), whose sum is σ = 365056272. Its totient is φ = 41043200.

The previous prime is 138888131. The next prime is 138888179. The reversal of 138888156 is 651888831.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58366 + ... + 60698.

It is an arithmetic number, because the mean of its divisors is an integer number (5070226).

Almost surely, 2^138888156 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 138888156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182528136).

138888156 is an abundant number, since it is smaller than the sum of its proper divisors (226168116).

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

138888156 is a wasteful number, since it uses less digits than its factorization.

138888156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403 (or 2390 counting only the distinct ones).

The product of its digits is 368640, while the sum is 48.

The square root of 138888156 is about 11785.0819258926. The cubic root of 138888156 is about 517.8711734216.

The spelling of 138888156 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, one hundred fifty-six".