138287636 has 12 divisors (see below), whose sum is σ = 242087412. Its totient is φ = 69119808.

The previous prime is 138287627. The next prime is 138287647. The reversal of 138287636 is 636782831.

It can be written as a sum of positive squares in 2 ways, for example, as 117072400 + 21215236 = 10820^2 + 4606^2 .

It is a congruent number.

It is an unprimeable number.

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, 15566 + ... + 22778.

It is an arithmetic number, because the mean of its divisors is an integer number (20173951).

Almost surely, 2^138287636 is an apocalyptic number.

It is an amenable number.

138287636 is a deficient number, since it is larger than the sum of its proper divisors (103799776).

138287636 is a wasteful number, since it uses less digits than its factorization.

138287636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12010 (or 12008 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 138287636 is about 11759.5763529134. The cubic root of 138287636 is about 517.1237103674.

The spelling of 138287636 in words is "one hundred thirty-eight million, two hundred eighty-seven thousand, six hundred thirty-six".