138538808 has 32 divisors (see below), whose sum is σ = 265154160. Its totient is φ = 67841280.

The previous prime is 138538801. The next prime is 138538853. The reversal of 138538808 is 808835831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138538801) 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 7 ways as a sum of consecutive naturals, for example, 152291 + ... + 153197.

Almost surely, 2^138538808 is an apocalyptic number.

It is an amenable number.

138538808 is a deficient number, since it is larger than the sum of its proper divisors (126615352).

138538808 is a wasteful number, since it uses less digits than its factorization.

138538808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287 (or 1283 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 138538808 is about 11770.2509743845. The cubic root of 138538808 is about 517.4366051463.

The spelling of 138538808 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, eight hundred eight".