12138525 has 72 divisors (see below), whose sum is σ = 26010240. Its totient is φ = 5533920.

The previous prime is 12138523. The next prime is 12138541. The reversal of 12138525 is 52583121.

It is a happy number.

12138525 is a `hidden beast` number, since 1 + 2 + 138 + 525 = 666.

12138525 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12138525 - 2¹ = 12138523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (2400) is a multiple of the sum of its prime factors (400).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138521) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 32892 + ... + 33258.

Almost surely, 2^12138525 is an apocalyptic number.

12138525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12138525 is an abundant number, since it is smaller than the sum of its proper divisors (13871715).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12138525 is a wasteful number, since it uses less digits than its factorization.

12138525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 382 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 12138525 is about 3484.0386048378. The cubic root of 12138525 is about 229.8204332532.

The spelling of 12138525 in words is "twelve million, one hundred thirty-eight thousand, five hundred twenty-five".