138815873 has 16 divisors (see below), whose sum is σ = 165849600. Its totient is φ = 116071200.

The previous prime is 138815857. The next prime is 138815891. The reversal of 138815873 is 378518831.

It is not a de Polignac number, because 138815873 - 2⁴ = 138815857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138815473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9128 + ... + 18998.

It is an arithmetic number, because the mean of its divisors is an integer number (10365600).

Almost surely, 2^138815873 is an apocalyptic number.

It is an amenable number.

138815873 is a deficient number, since it is larger than the sum of its proper divisors (27033727).

138815873 is an frugal number, since it uses more digits than its factorization.

138815873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9933 (or 9919 counting only the distinct ones).

The product of its digits is 161280, while the sum is 44.

The square root of 138815873 is about 11782.0148107189. The cubic root of 138815873 is about 517.7813174806.

The spelling of 138815873 in words is "one hundred thirty-eight million, eight hundred fifteen thousand, eight hundred seventy-three".