138791 has 4 divisors (see below), whose sum is σ = 141792. Its totient is φ = 135792.

The previous prime is 138763. The next prime is 138793. The reversal of 138791 is 197831.

138791 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.

It is a cyclic number.

It is not a de Polignac number, because 138791 - 2⁶ = 138727 is a prime.

It is a Duffinian number.

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 138791.

It is not an unprimeable number, because it can be changed into a prime (138793) 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, 1430 + ... + 1523.

It is an arithmetic number, because the mean of its divisors is an integer number (35448).

2¹³⁸⁷⁹¹ is an apocalyptic number.

138791 is a deficient number, since it is larger than the sum of its proper divisors (3001).

138791 is an equidigital number, since it uses as much as digits as its factorization.

138791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3000.

The product of its digits is 1512, while the sum is 29.

The square root of 138791 is about 372.5466413753. The cubic root of 138791 is about 51.7750390316.

It can be divided in two parts, 138 and 791, that added together give a palindrome (929).

The spelling of 138791 in words is "one hundred thirty-eight thousand, seven hundred ninety-one".