138538788 has 24 divisors (see below), whose sum is σ = 325728480. Its totient is φ = 45826560.

The previous prime is 138538759. The next prime is 138538789. The reversal of 138538788 is 887835831.

It is a self number, because there is not a number n which added to its sum of digits gives 138538788.

It is not an unprimeable number, because it can be changed into a prime (138538789) 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, 42493 + ... + 45636.

It is an arithmetic number, because the mean of its divisors is an integer number (13572020).

Almost surely, 2^138538788 is an apocalyptic number.

It is an amenable number.

138538788 is an abundant number, since it is smaller than the sum of its proper divisors (187189692).

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

138538788 is a wasteful number, since it uses less digits than its factorization.

138538788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88267 (or 88265 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 51.

The square root of 138538788 is about 11770.2501247849. The cubic root of 138538788 is about 517.4365802466.

The spelling of 138538788 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, seven hundred eighty-eight".