138488140 has 48 divisors (see below), whose sum is σ = 334623744. Its totient is φ = 47160000.

The previous prime is 138488123. The next prime is 138488143. The reversal of 138488140 is 41884831.

It is a self number, because there is not a number n which added to its sum of digits gives 138488140.

It is not an unprimeable number, because it can be changed into a prime (138488143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17865 + ... + 24415.

It is an arithmetic number, because the mean of its divisors is an integer number (6971328).

Almost surely, 2^138488140 is an apocalyptic number.

138488140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138488140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167311872).

138488140 is an abundant number, since it is smaller than the sum of its proper divisors (196135604).

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

138488140 is a wasteful number, since it uses less digits than its factorization.

138488140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6718 (or 6716 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 138488140 is about 11768.0984020359. The cubic root of 138488140 is about 517.3735165068.

The spelling of 138488140 in words is "one hundred thirty-eight million, four hundred eighty-eight thousand, one hundred forty".