138529812 has 12 divisors (see below), whose sum is σ = 323236256. Its totient is φ = 46176600.

The previous prime is 138529777. The next prime is 138529819. The reversal of 138529812 is 218925831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138529819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5772064 + ... + 5772087.

Almost surely, 2^138529812 is an apocalyptic number.

138529812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138529812 is an abundant number, since it is smaller than the sum of its proper divisors (184706444).

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

138529812 is a wasteful number, since it uses less digits than its factorization.

138529812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11544158 (or 11544156 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The square root of 138529812 is about 11769.8688183004. The cubic root of 138529812 is about 517.4254050104.

The spelling of 138529812 in words is "one hundred thirty-eight million, five hundred twenty-nine thousand, eight hundred twelve".