12138125 has 10 divisors (see below), whose sum is σ = 15168582. Its totient is φ = 9710000.

The previous prime is 12138107. The next prime is 12138127. The reversal of 12138125 is 52183121.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 1471369 + 10666756 = 1213^2 + 3266^2 .

It is not a de Polignac number, because 12138125 - 2¹² = 12134029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12138125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138127) 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 9 ways as a sum of consecutive naturals, for example, 9086 + ... + 10335.

Almost surely, 2^12138125 is an apocalyptic number.

It is an amenable number.

12138125 is a deficient number, since it is larger than the sum of its proper divisors (3030457).

12138125 is an frugal number, since it uses more digits than its factorization.

12138125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19441 (or 19426 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 12138125 is about 3483.9811997197. The cubic root of 12138125 is about 229.8179088063.

The spelling of 12138125 in words is "twelve million, one hundred thirty-eight thousand, one hundred twenty-five".