138859878 has 16 divisors (see below), whose sum is σ = 289794816. Its totient is φ = 44274120.

The previous prime is 138859873. The next prime is 138859879. The reversal of 138859878 is 878958831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138859871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502978 + ... + 503253.

It is an arithmetic number, because the mean of its divisors is an integer number (18112176).

Almost surely, 2^138859878 is an apocalyptic number.

138859878 is an abundant number, since it is smaller than the sum of its proper divisors (150934938).

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

138859878 is a wasteful number, since it uses less digits than its factorization.

138859878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006259.

The product of its digits is 3870720, while the sum is 57.

The square root of 138859878 is about 11783.8821277200. The cubic root of 138859878 is about 517.8360243840.

It can be divided in two parts, 138 and 859878, that added together give a triangular number (860016 = T₁₃₁₁).

The spelling of 138859878 in words is "one hundred thirty-eight million, eight hundred fifty-nine thousand, eight hundred seventy-eight".