138640076 has 12 divisors (see below), whose sum is σ = 243636960. Its totient is φ = 69029520.

The previous prime is 138640057. The next prime is 138640081. The reversal of 138640076 is 670046831.

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, 71555 + ... + 73466.

It is an arithmetic number, because the mean of its divisors is an integer number (20303080).

Almost surely, 2^138640076 is an apocalyptic number.

It is an amenable number.

138640076 is a deficient number, since it is larger than the sum of its proper divisors (104996884).

138640076 is a wasteful number, since it uses less digits than its factorization.

138640076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145264 (or 145262 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 138640076 is about 11774.5520509275. The cubic root of 138640076 is about 517.5626516755.

The spelling of 138640076 in words is "one hundred thirty-eight million, six hundred forty thousand, seventy-six".