138836168 has 16 divisors (see below), whose sum is σ = 266667660. Its totient is φ = 67724800.

The previous prime is 138836123. The next prime is 138836171. The reversal of 138836168 is 861638831.

It can be written as a sum of positive squares in 2 ways, for example, as 102860164 + 35976004 = 10142^2 + 5998^2 .

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, 211313 + ... + 211968.

Almost surely, 2^138836168 is an apocalyptic number.

It is an amenable number.

138836168 is a deficient number, since it is larger than the sum of its proper divisors (127831492).

138836168 is a wasteful number, since it uses less digits than its factorization.

138836168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423328 (or 423324 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 138836168 is about 11782.8760495899. The cubic root of 138836168 is about 517.8065496089.

The spelling of 138836168 in words is "one hundred thirty-eight million, eight hundred thirty-six thousand, one hundred sixty-eight".