138878875 has 8 divisors (see below), whose sum is σ = 173320992. Its totient is φ = 111103000.

The previous prime is 138878867. The next prime is 138878879. The reversal of 138878875 is 578878831.

It is not a de Polignac number, because 138878875 - 2³ = 138878867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138878879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555391 + ... + 555640.

It is an arithmetic number, because the mean of its divisors is an integer number (21665124).

Almost surely, 2^138878875 is an apocalyptic number.

138878875 is a deficient number, since it is larger than the sum of its proper divisors (34442117).

138878875 is an equidigital number, since it uses as much as digits as its factorization.

138878875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111046 (or 1111036 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 55.

The square root of 138878875 is about 11784.6881587932. The cubic root of 138878875 is about 517.8596378341.

The spelling of 138878875 in words is "one hundred thirty-eight million, eight hundred seventy-eight thousand, eight hundred seventy-five".