138664912 has 20 divisors (see below), whose sum is σ = 270379396. Its totient is φ = 68889600.

The previous prime is 138664873. The next prime is 138664969. The reversal of 138664912 is 219466831.

It can be written as a sum of positive squares in 2 ways, for example, as 18455616 + 120209296 = 4296^2 + 10964^2 .

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 3 ways as a sum of consecutive naturals, for example, 25089 + ... + 30112.

Almost surely, 2^138664912 is an apocalyptic number.

It is an amenable number.

138664912 is a deficient number, since it is larger than the sum of its proper divisors (131714484).

138664912 is a wasteful number, since it uses less digits than its factorization.

138664912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55366 (or 55360 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 138664912 is about 11775.6066510393. The cubic root of 138664912 is about 517.5935552423.

The spelling of 138664912 in words is "one hundred thirty-eight million, six hundred sixty-four thousand, nine hundred twelve".