138606 has 16 divisors (see below), whose sum is σ = 298704. Its totient is φ = 42624.

The previous prime is 138599. The next prime is 138617. The reversal of 138606 is 606831.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 811 + ... + 966.

It is an arithmetic number, because the mean of its divisors is an integer number (18669).

2¹³⁸⁶⁰⁶ is an apocalyptic number.

138606 is an abundant number, since it is smaller than the sum of its proper divisors (160098).

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

138606 is a wasteful number, since it uses less digits than its factorization.

138606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 138606 is about 372.2982675222. The cubic root of 138606 is about 51.7520244721.

The spelling of 138606 in words is "one hundred thirty-eight thousand, six hundred six".