138259 has 4 divisors (see below), whose sum is σ = 150840. Its totient is φ = 125680.

The previous prime is 138251. The next prime is 138283. The reversal of 138259 is 952831.

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 138259 - 2³ = 138251 is a prime.

It is a Duffinian number.

138259 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (138251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6274 + ... + 6295.

It is an arithmetic number, because the mean of its divisors is an integer number (37710).

2¹³⁸²⁵⁹ is an apocalyptic number.

138259 is a deficient number, since it is larger than the sum of its proper divisors (12581).

138259 is a wasteful number, since it uses less digits than its factorization.

138259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12580.

The product of its digits is 2160, while the sum is 28.

The square root of 138259 is about 371.8319512898. The cubic root of 138259 is about 51.7088013330.

It can be divided in two parts, 1382 and 59, that added together give a palindrome (1441).

The spelling of 138259 in words is "one hundred thirty-eight thousand, two hundred fifty-nine".