138136637 has 4 divisors (see below), whose sum is σ = 138546876. Its totient is φ = 137726400.

The previous prime is 138136591. The next prime is 138136639. The reversal of 138136637 is 736631831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26327161 + 111809476 = 5131^2 + 10574^2 .

It is a cyclic number.

It is not a de Polignac number, because 138136637 - 2⁶ = 138136573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138136637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138136639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204614 + ... + 205287.

It is an arithmetic number, because the mean of its divisors is an integer number (34636719).

Almost surely, 2^138136637 is an apocalyptic number.

It is an amenable number.

138136637 is a deficient number, since it is larger than the sum of its proper divisors (410239).

138136637 is an equidigital number, since it uses as much as digits as its factorization.

138136637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410238.

The product of its digits is 54432, while the sum is 38.

The square root of 138136637 is about 11753.1543425584. The cubic root of 138136637 is about 516.9354226227.

The spelling of 138136637 in words is "one hundred thirty-eight million, one hundred thirty-six thousand, six hundred thirty-seven".