138307636 has 6 divisors (see below), whose sum is σ = 242038370. Its totient is φ = 69153816.

The previous prime is 138307633. The next prime is 138307639. The reversal of 138307636 is 636703831.

It is an interprime number because it is at equal distance from previous prime (138307633) and next prime (138307639).

It can be written as a sum of positive squares in only one way, i.e., 109620900 + 28686736 = 10470^2 + 5356^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138307595 and 138307604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138307633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17288451 + ... + 17288458.

Almost surely, 2^138307636 is an apocalyptic number.

It is an amenable number.

138307636 is a deficient number, since it is larger than the sum of its proper divisors (103730734).

138307636 is a wasteful number, since it uses less digits than its factorization.

138307636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34576913 (or 34576911 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 138307636 is about 11760.4266929393. The cubic root of 138307636 is about 517.1486390257.

The spelling of 138307636 in words is "one hundred thirty-eight million, three hundred seven thousand, six hundred thirty-six".