138706 has 8 divisors (see below), whose sum is σ = 209664. Its totient is φ = 68820.

The previous prime is 138683. The next prime is 138727. The reversal of 138706 is 607831.

138706 is nontrivially palindromic in base 4.

138706 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291 + ... + 601.

It is an arithmetic number, because the mean of its divisors is an integer number (26208).

2¹³⁸⁷⁰⁶ is an apocalyptic number.

138706 is a deficient number, since it is larger than the sum of its proper divisors (70958).

138706 is a wasteful number, since it uses less digits than its factorization.

138706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 138706 is about 372.4325442278. The cubic root of 138706 is about 51.7644673158.

The spelling of 138706 in words is "one hundred thirty-eight thousand, seven hundred six".