138293 has 4 divisors (see below), whose sum is σ = 141708. Its totient is φ = 134880.

The previous prime is 138289. The next prime is 138311. The reversal of 138293 is 392831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77284 + 61009 = 278^2 + 247^2 .

It is a cyclic number.

It is not a de Polignac number, because 138293 - 2² = 138289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138283) 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, 1646 + ... + 1727.

It is an arithmetic number, because the mean of its divisors is an integer number (35427).

2¹³⁸²⁹³ is an apocalyptic number.

It is an amenable number.

138293 is a deficient number, since it is larger than the sum of its proper divisors (3415).

138293 is an equidigital number, since it uses as much as digits as its factorization.

138293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414.

The product of its digits is 1296, while the sum is 26.

The square root of 138293 is about 371.8776680577. The cubic root of 138293 is about 51.7130396469.

The spelling of 138293 in words is "one hundred thirty-eight thousand, two hundred ninety-three".