138864125 has 8 divisors (see below), whose sum is σ = 173302584. Its totient is φ = 111091200.

The previous prime is 138864113. The next prime is 138864137. The reversal of 138864125 is 521468831.

It is an interprime number because it is at equal distance from previous prime (138864113) and next prime (138864137).

It can be written as a sum of positive squares in 4 ways, for example, as 7027801 + 131836324 = 2651^2 + 11482^2 .

It is a de Polignac number, because none of the positive numbers 2^k-138864125 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555332 + ... + 555581.

It is an arithmetic number, because the mean of its divisors is an integer number (21662823).

Almost surely, 2^138864125 is an apocalyptic number.

It is an amenable number.

138864125 is a deficient number, since it is larger than the sum of its proper divisors (34438459).

138864125 is an equidigital number, since it uses as much as digits as its factorization.

138864125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110928 (or 1110918 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 138864125 is about 11784.0623301135. The cubic root of 138864125 is about 517.8413036320.

The spelling of 138864125 in words is "one hundred thirty-eight million, eight hundred sixty-four thousand, one hundred twenty-five".