138968125 has 10 divisors (see below), whose sum is σ = 173655350. Its totient is φ = 111174000.

The previous prime is 138968119. The next prime is 138968153. The reversal of 138968125 is 521869831.

It can be written as a sum of positive squares in 5 ways, for example, as 54952569 + 84015556 = 7413^2 + 9166^2 .

It is not a de Polignac number, because 138968125 - 2¹⁷ = 138837053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 110550 + ... + 111799.

It is an arithmetic number, because the mean of its divisors is an integer number (17365535).

Almost surely, 2^138968125 is an apocalyptic number.

It is an amenable number.

138968125 is a deficient number, since it is larger than the sum of its proper divisors (34687225).

138968125 is an frugal number, since it uses more digits than its factorization.

138968125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222369 (or 222354 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The square root of 138968125 is about 11788.4742439384. The cubic root of 138968125 is about 517.9705476116.

The spelling of 138968125 in words is "one hundred thirty-eight million, nine hundred sixty-eight thousand, one hundred twenty-five".