138539678 has 8 divisors (see below), whose sum is σ = 218746920. Its totient is φ = 65624040.

The previous prime is 138539677. The next prime is 138539683. The reversal of 138539678 is 876935831.

It is a happy number.

138539678 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138539671) 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 3 ways as a sum of consecutive naturals, for example, 1822853 + ... + 1822928.

It is an arithmetic number, because the mean of its divisors is an integer number (27343365).

Almost surely, 2^138539678 is an apocalyptic number.

138539678 is a deficient number, since it is larger than the sum of its proper divisors (80207242).

138539678 is a wasteful number, since it uses less digits than its factorization.

138539678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645802.

The product of its digits is 1088640, while the sum is 50.

The square root of 138539678 is about 11770.2879319072. The cubic root of 138539678 is about 517.4376882818.

The spelling of 138539678 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, six hundred seventy-eight".