138715873 has 4 divisors (see below), whose sum is σ = 138887728. Its totient is φ = 138544020.

The previous prime is 138715861. The next prime is 138715883. The reversal of 138715873 is 378517831.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138715873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138715883) 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, 84711 + ... + 86332.

It is an arithmetic number, because the mean of its divisors is an integer number (34721932).

Almost surely, 2^138715873 is an apocalyptic number.

It is an amenable number.

138715873 is a deficient number, since it is larger than the sum of its proper divisors (171855).

138715873 is an equidigital number, since it uses as much as digits as its factorization.

138715873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171854.

The product of its digits is 141120, while the sum is 43.

The square root of 138715873 is about 11777.7702898299. The cubic root of 138715873 is about 517.6569547333.

The spelling of 138715873 in words is "one hundred thirty-eight million, seven hundred fifteen thousand, eight hundred seventy-three".