138879140 has 24 divisors (see below), whose sum is σ = 291967872. Its totient is φ = 55490400.

The previous prime is 138879131. The next prime is 138879157. The reversal of 138879140 is 41978831.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17717 + ... + 24323.

It is an arithmetic number, because the mean of its divisors is an integer number (12165328).

Almost surely, 2^138879140 is an apocalyptic number.

138879140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138879140 is an abundant number, since it is smaller than the sum of its proper divisors (153088732).

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

138879140 is a wasteful number, since it uses less digits than its factorization.

138879140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7667 (or 7665 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 138879140 is about 11784.6994021910. The cubic root of 138879140 is about 517.8599672163.

It can be divided in two parts, 1388791 and 40, that added together give a palindrome (1388831).

The spelling of 138879140 in words is "one hundred thirty-eight million, eight hundred seventy-nine thousand, one hundred forty".