138219 has 4 divisors (see below), whose sum is σ = 184296. Its totient is φ = 92144.

The previous prime is 138209. The next prime is 138239. The reversal of 138219 is 912831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138219 - 2⁹ = 137707 is a prime.

It is a super-2 number, since 2×138219² = 38208983922, which contains 22 as substring.

It is a D-number.

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

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, 23034 + ... + 23039.

It is an arithmetic number, because the mean of its divisors is an integer number (46074).

2¹³⁸²¹⁹ is an apocalyptic number.

138219 is a deficient number, since it is larger than the sum of its proper divisors (46077).

138219 is an equidigital number, since it uses as much as digits as its factorization.

138219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46076.

The product of its digits is 432, while the sum is 24.

The square root of 138219 is about 371.7781596598. The cubic root of 138219 is about 51.7038141916.

The spelling of 138219 in words is "one hundred thirty-eight thousand, two hundred nineteen".