138647740 has 48 divisors (see below), whose sum is σ = 363009024. Its totient is φ = 43214400.

The previous prime is 138647713. The next prime is 138647759. The reversal of 138647740 is 47746831.

138647740 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 138647693 and 138647702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43476 + ... + 46555.

It is an arithmetic number, because the mean of its divisors is an integer number (7562688).

Almost surely, 2^138647740 is an apocalyptic number.

138647740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138647740 is an abundant number, since it is smaller than the sum of its proper divisors (224361284).

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

138647740 is a wasteful number, since it uses less digits than its factorization.

138647740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90058 (or 90056 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 138647740 is about 11774.8774940549. The cubic root of 138647740 is about 517.5721884251.

Subtracting from 138647740 its reverse (47746831), we obtain a palindrome (90900909).

The spelling of 138647740 in words is "one hundred thirty-eight million, six hundred forty-seven thousand, seven hundred forty".