138443 has 4 divisors (see below), whose sum is σ = 139440. Its totient is φ = 137448.

The previous prime is 138433. The next prime is 138449. The reversal of 138443 is 344831.

138443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 344831 = 19 ⋅18149.

It is a cyclic number.

It is not a de Polignac number, because 138443 - 2⁴ = 138427 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138443.

It is not an unprimeable number, because it can be changed into a prime (138449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248 + ... + 581.

It is an arithmetic number, because the mean of its divisors is an integer number (34860).

2¹³⁸⁴⁴³ is an apocalyptic number.

138443 is a deficient number, since it is larger than the sum of its proper divisors (997).

138443 is an equidigital number, since it uses as much as digits as its factorization.

138443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

The product of its digits is 1152, while the sum is 23.

The square root of 138443 is about 372.0792926246. The cubic root of 138443 is about 51.7317298026.

The spelling of 138443 in words is "one hundred thirty-eight thousand, four hundred forty-three".