138547878 has 32 divisors (see below), whose sum is σ = 317117184. Its totient is φ = 39530592.

The previous prime is 138547873. The next prime is 138547889. The reversal of 138547878 is 878745831.

It is a self number, because there is not a number n which added to its sum of digits gives 138547878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138547873) 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, 36276 + ... + 39912.

It is an arithmetic number, because the mean of its divisors is an integer number (9909912).

Almost surely, 2^138547878 is an apocalyptic number.

138547878 is an abundant number, since it is smaller than the sum of its proper divisors (178569306).

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

138547878 is a wasteful number, since it uses less digits than its factorization.

138547878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4556.

The product of its digits is 1505280, while the sum is 51.

The square root of 138547878 is about 11770.6362614771. The cubic root of 138547878 is about 517.4478969224.

The spelling of 138547878 in words is "one hundred thirty-eight million, five hundred forty-seven thousand, eight hundred seventy-eight".