138881375 has 16 divisors (see below), whose sum is σ = 174388032. Its totient is φ = 110423200.

The previous prime is 138881371. The next prime is 138881411. The reversal of 138881375 is 573188831.

138881375 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138881375 - 2² = 138881371 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 (138881371) 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, 17549 + ... + 24201.

It is an arithmetic number, because the mean of its divisors is an integer number (10899252).

Almost surely, 2^138881375 is an apocalyptic number.

138881375 is a deficient number, since it is larger than the sum of its proper divisors (35506657).

138881375 is an equidigital number, since it uses as much as digits as its factorization.

138881375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6835 (or 6825 counting only the distinct ones).

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

The square root of 138881375 is about 11784.7942281569. The cubic root of 138881375 is about 517.8627451973.

The spelling of 138881375 in words is "one hundred thirty-eight million, eight hundred eighty-one thousand, three hundred seventy-five".