138757636 has 6 divisors (see below), whose sum is σ = 242825870. Its totient is φ = 69378816.

The previous prime is 138757631. The next prime is 138757639. The reversal of 138757636 is 636757831.

It can be written as a sum of positive squares in only one way, i.e., 127238400 + 11519236 = 11280^2 + 3394^2 .

It is not an unprimeable number, because it can be changed into a prime (138757631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17344701 + ... + 17344708.

Almost surely, 2^138757636 is an apocalyptic number.

It is an amenable number.

138757636 is a deficient number, since it is larger than the sum of its proper divisors (104068234).

138757636 is a wasteful number, since it uses less digits than its factorization.

138757636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34689413 (or 34689411 counting only the distinct ones).

The product of its digits is 635040, while the sum is 46.

The square root of 138757636 is about 11779.5431150788. The cubic root of 138757636 is about 517.7088996134.

The spelling of 138757636 in words is "one hundred thirty-eight million, seven hundred fifty-seven thousand, six hundred thirty-six".