138876293 has 4 divisors (see below), whose sum is σ = 139208160. Its totient is φ = 138544428.

The previous prime is 138876289. The next prime is 138876299. The reversal of 138876293 is 392678831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 392678831 = 1093 ⋅359267.

It is a cyclic number.

It is not a de Polignac number, because 138876293 - 2² = 138876289 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 (138876299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165305 + ... + 166142.

It is an arithmetic number, because the mean of its divisors is an integer number (34802040).

Almost surely, 2^138876293 is an apocalyptic number.

It is an amenable number.

138876293 is a deficient number, since it is larger than the sum of its proper divisors (331867).

138876293 is an equidigital number, since it uses as much as digits as its factorization.

138876293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331866.

The product of its digits is 435456, while the sum is 47.

The square root of 138876293 is about 11784.5786093521. The cubic root of 138876293 is about 517.8564285102.

The spelling of 138876293 in words is "one hundred thirty-eight million, eight hundred seventy-six thousand, two hundred ninety-three".