138755637 has 6 divisors (see below), whose sum is σ = 200424822. Its totient is φ = 92503752.

The previous prime is 138755623. The next prime is 138755641. The reversal of 138755637 is 736557831.

138755637 is a `hidden beast` number, since 1 + 3 + 8 + 7 + 5 + 5 + 637 = 666.

It can be written as a sum of positive squares in only one way, i.e., 120428676 + 18326961 = 10974^2 + 4281^2 .

It is not a de Polignac number, because 138755637 - 2¹⁹ = 138231349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138755592 and 138755601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138755657) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 7708638 + ... + 7708655.

It is an arithmetic number, because the mean of its divisors is an integer number (33404137).

Almost surely, 2^138755637 is an apocalyptic number.

It is an amenable number.

138755637 is a deficient number, since it is larger than the sum of its proper divisors (61669185).

138755637 is a wasteful number, since it uses less digits than its factorization.

138755637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15417299 (or 15417296 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 138755637 is about 11779.4582642836. The cubic root of 138755637 is about 517.7064134918.

The spelling of 138755637 in words is "one hundred thirty-eight million, seven hundred fifty-five thousand, six hundred thirty-seven".