138189 has 8 divisors (see below), whose sum is σ = 187072. Its totient is φ = 90720.

The previous prime is 138181. The next prime is 138191. The reversal of 138189 is 981831.

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

It is not a de Polignac number, because 138189 - 2³ = 138181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97 + ... + 534.

It is an arithmetic number, because the mean of its divisors is an integer number (23384).

2¹³⁸¹⁸⁹ is an apocalyptic number.

It is an amenable number.

138189 is a deficient number, since it is larger than the sum of its proper divisors (48883).

138189 is an equidigital number, since it uses as much as digits as its factorization.

138189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707.

The product of its digits is 1728, while the sum is 30.

The square root of 138189 is about 371.7378108291. The cubic root of 138189 is about 51.7000732041.

The spelling of 138189 in words is "one hundred thirty-eight thousand, one hundred eighty-nine".