138858 has 8 divisors (see below), whose sum is σ = 277728. Its totient is φ = 46284.

The previous prime is 138841. The next prime is 138863. The reversal of 138858 is 858831.

138858 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.

138858 is an admirable number.

It is a plaindrome in base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138858.

It is an unprimeable number.

138858 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11566 + ... + 11577.

It is an arithmetic number, because the mean of its divisors is an integer number (34716).

2¹³⁸⁸⁵⁸ is an apocalyptic number.

138858 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.

138858 is a wasteful number, since it uses less digits than its factorization.

138858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23148.

The product of its digits is 7680, while the sum is 33.

The square root of 138858 is about 372.6365521524. The cubic root of 138858 is about 51.7833689895.

The spelling of 138858 in words is "one hundred thirty-eight thousand, eight hundred fifty-eight".