138822 has 16 divisors (see below), whose sum is σ = 294192. Its totient is φ = 43520.

The previous prime is 138821. The next prime is 138829. The reversal of 138822 is 228831.

Added to its reverse (228831) it gives a triangular number (367653 = T₈₅₇).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 138792 and 138801.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138822.

It is not an unprimeable number, because it can be changed into a prime (138821) 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, 579 + ... + 782.

It is an arithmetic number, because the mean of its divisors is an integer number (18387).

2¹³⁸⁸²² is an apocalyptic number.

138822 is an abundant number, since it is smaller than the sum of its proper divisors (155370).

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

138822 is a wasteful number, since it uses less digits than its factorization.

138822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383.

The product of its digits is 768, while the sum is 24.

The square root of 138822 is about 372.5882445811. The cubic root of 138822 is about 51.7788935244.

Adding to 138822 its reverse (228831), we get a triangular number (367653 = T₈₅₇).

Subtracting 138822 from its reverse (228831), we obtain a palindrome (90009).

The spelling of 138822 in words is "one hundred thirty-eight thousand, eight hundred twenty-two".