138678108 has 24 divisors (see below), whose sum is σ = 324792720. Its totient is φ = 46053120.

The previous prime is 138678107. The next prime is 138678121. The reversal of 138678108 is 801876831.

It is a self number, because there is not a number n which added to its sum of digits gives 138678108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138678103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18253 + ... + 24708.

It is an arithmetic number, because the mean of its divisors is an integer number (13533030).

Almost surely, 2^138678108 is an apocalyptic number.

It is an amenable number.

138678108 is an abundant number, since it is smaller than the sum of its proper divisors (186114612).

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

138678108 is a wasteful number, since it uses less digits than its factorization.

138678108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43237 (or 43235 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 138678108 is about 11776.1669485448. The cubic root of 138678108 is about 517.6099735940.

The spelling of 138678108 in words is "one hundred thirty-eight million, six hundred seventy-eight thousand, one hundred eight".