138839 has 4 divisors (see below), whose sum is σ = 147024. Its totient is φ = 130656.

The previous prime is 138829. The next prime is 138841. The reversal of 138839 is 938831.

138839 is nontrivially palindromic in base 3.

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 138839 - 2¹⁶ = 73303 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 (138829) 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, 4067 + ... + 4100.

It is an arithmetic number, because the mean of its divisors is an integer number (36756).

2¹³⁸⁸³⁹ is an apocalyptic number.

138839 is a deficient number, since it is larger than the sum of its proper divisors (8185).

138839 is an equidigital number, since it uses as much as digits as its factorization.

138839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8184.

The product of its digits is 5184, while the sum is 32.

The square root of 138839 is about 372.6110572702. The cubic root of 138839 is about 51.7810070349.

The spelling of 138839 in words is "one hundred thirty-eight thousand, eight hundred thirty-nine".