138206 has 8 divisors (see below), whose sum is σ = 218280. Its totient is φ = 65448.

The previous prime is 138197. The next prime is 138209. The reversal of 138206 is 602831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138209) by changing a digit.

138206 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1781 + ... + 1856.

It is an arithmetic number, because the mean of its divisors is an integer number (27285).

2¹³⁸²⁰⁶ is an apocalyptic number.

138206 is a deficient number, since it is larger than the sum of its proper divisors (80074).

138206 is a wasteful number, since it uses less digits than its factorization.

138206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 138206 is about 371.7606757041. The cubic root of 138206 is about 51.7021931635.

The spelling of 138206 in words is "one hundred thirty-eight thousand, two hundred six".