138940180 has 48 divisors (see below), whose sum is σ = 301069440. Its totient is φ = 53820288.

The previous prime is 138940157. The next prime is 138940187. The reversal of 138940180 is 81049831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138940187) 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, 265399 + ... + 265921.

It is an arithmetic number, because the mean of its divisors is an integer number (6272280).

Almost surely, 2^138940180 is an apocalyptic number.

138940180 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 138940180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150534720).

138940180 is an abundant number, since it is smaller than the sum of its proper divisors (162129260).

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

138940180 is a wasteful number, since it uses less digits than its factorization.

138940180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928 (or 926 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 138940180 is about 11787.2889164557. The cubic root of 138940180 is about 517.9358258429.

The spelling of 138940180 in words is "one hundred thirty-eight million, nine hundred forty thousand, one hundred eighty".