138686542 has 8 divisors (see below), whose sum is σ = 208174176. Its totient is φ = 69295152.

The previous prime is 138686539. The next prime is 138686551. The reversal of 138686542 is 245686831.

138686542 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20343 + ... + 26290.

It is an arithmetic number, because the mean of its divisors is an integer number (26021772).

Almost surely, 2^138686542 is an apocalyptic number.

138686542 is a deficient number, since it is larger than the sum of its proper divisors (69487634).

138686542 is a wasteful number, since it uses less digits than its factorization.

138686542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48122.

The product of its digits is 276480, while the sum is 43.

The square root of 138686542 is about 11776.5250392465. The cubic root of 138686542 is about 517.6204665600.

The spelling of 138686542 in words is "one hundred thirty-eight million, six hundred eighty-six thousand, five hundred forty-two".