138507125 has 8 divisors (see below), whose sum is σ = 172857048. Its totient is φ = 110805600.

The previous prime is 138507121. The next prime is 138507133. The reversal of 138507125 is 521705831.

It can be written as a sum of positive squares in 4 ways, for example, as 749956 + 137757169 = 866^2 + 11737^2 .

It is not a de Polignac number, because 138507125 - 2² = 138507121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138507091 and 138507100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138507121) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 553904 + ... + 554153.

It is an arithmetic number, because the mean of its divisors is an integer number (21607131).

Almost surely, 2^138507125 is an apocalyptic number.

It is an amenable number.

138507125 is a deficient number, since it is larger than the sum of its proper divisors (34349923).

138507125 is an equidigital number, since it uses as much as digits as its factorization.

138507125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108072 (or 1108062 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 138507125 is about 11768.9050042899. The cubic root of 138507125 is about 517.3971572494.

The spelling of 138507125 in words is "one hundred thirty-eight million, five hundred seven thousand, one hundred twenty-five".