138422 has 8 divisors (see below), whose sum is σ = 210936. Its totient is φ = 68112.

The previous prime is 138407. The next prime is 138427. The reversal of 138422 is 224831.

138422 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 a junction number, because it is equal to n+sod(n) for n = 138394 and 138403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138427) by changing a digit.

138422 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383 + ... + 650.

It is an arithmetic number, because the mean of its divisors is an integer number (26367).

2¹³⁸⁴²² is an apocalyptic number.

138422 is a deficient number, since it is larger than the sum of its proper divisors (72514).

138422 is a wasteful number, since it uses less digits than its factorization.

138422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102.

The product of its digits is 384, while the sum is 20.

The square root of 138422 is about 372.0510717630. The cubic root of 138422 is about 51.7291139938.

The spelling of 138422 in words is "one hundred thirty-eight thousand, four hundred twenty-two".