138881488 has 40 divisors (see below), whose sum is σ = 292401920. Its totient is φ = 63659520.

The previous prime is 138881453. The next prime is 138881489. The reversal of 138881488 is 884188831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138881489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2056 + ... + 16792.

It is an arithmetic number, because the mean of its divisors is an integer number (7310048).

Almost surely, 2^138881488 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 138881488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146200960).

138881488 is an abundant number, since it is smaller than the sum of its proper divisors (153520432).

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

138881488 is a wasteful number, since it uses less digits than its factorization.

138881488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14795 (or 14789 counting only the distinct ones).

The product of its digits is 393216, while the sum is 49.

The square root of 138881488 is about 11784.7990224696. The cubic root of 138881488 is about 517.8628856492.

It can be divided in two parts, 13888 and 1488, that added together give a square (15376 = 124²).

The spelling of 138881488 in words is "one hundred thirty-eight million, eight hundred eighty-one thousand, four hundred eighty-eight".