138684558 has 8 divisors (see below), whose sum is σ = 277369128. Its totient is φ = 46228184.

The previous prime is 138684551. The next prime is 138684563. The reversal of 138684558 is 855486831.

138684558 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.

138684558 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138684551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11557041 + ... + 11557052.

It is an arithmetic number, because the mean of its divisors is an integer number (34671141).

Almost surely, 2^138684558 is an apocalyptic number.

138684558 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138684558 is a wasteful number, since it uses less digits than its factorization.

138684558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23114098.

The product of its digits is 921600, while the sum is 48.

The square root of 138684558 is about 11776.4408035705. The cubic root of 138684558 is about 517.6179982506.

The spelling of 138684558 in words is "one hundred thirty-eight million, six hundred eighty-four thousand, five hundred fifty-eight".