138005678 has 8 divisors (see below), whose sum is σ = 207104040. Its totient is φ = 68971000.

The previous prime is 138005641. The next prime is 138005687. The reversal of 138005678 is 876500831.

138005678 is digitally balanced in base 2, 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10073 + ... + 19428.

It is an arithmetic number, because the mean of its divisors is an integer number (25888005).

Almost surely, 2^138005678 is an apocalyptic number.

138005678 is a deficient number, since it is larger than the sum of its proper divisors (69098362).

138005678 is a wasteful number, since it uses less digits than its factorization.

138005678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31842.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 138005678 is about 11747.5817937140. The cubic root of 138005678 is about 516.7720125576.

The spelling of 138005678 in words is "one hundred thirty-eight million, five thousand, six hundred seventy-eight".