138712636 has 12 divisors (see below), whose sum is σ = 243194728. Its totient is φ = 69228432.

The previous prime is 138712633. The next prime is 138712643. The reversal of 138712636 is 636217831.

It is a junction number, because it is equal to n+sod(n) for n = 138712595 and 138712604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138712633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29511 + ... + 33886.

Almost surely, 2^138712636 is an apocalyptic number.

It is an amenable number.

138712636 is a deficient number, since it is larger than the sum of its proper divisors (104482092).

138712636 is a wasteful number, since it uses less digits than its factorization.

138712636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63948 (or 63946 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 138712636 is about 11777.6328691295. The cubic root of 138712636 is about 517.6529281126.

The spelling of 138712636 in words is "one hundred thirty-eight million, seven hundred twelve thousand, six hundred thirty-six".