138281168 has 20 divisors (see below), whose sum is σ = 268107840. Its totient is φ = 69092064.

The previous prime is 138281161. The next prime is 138281189. The reversal of 138281168 is 861182831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138281161) 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, 34703 + ... + 38481.

It is an arithmetic number, because the mean of its divisors is an integer number (13405392).

Almost surely, 2^138281168 is an apocalyptic number.

It is an amenable number.

138281168 is a deficient number, since it is larger than the sum of its proper divisors (129826672).

138281168 is a wasteful number, since it uses less digits than its factorization.

138281168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6074 (or 6068 counting only the distinct ones).

The product of its digits is 18432, while the sum is 38.

The square root of 138281168 is about 11759.3013397906. The cubic root of 138281168 is about 517.1156479250.

The spelling of 138281168 in words is "one hundred thirty-eight million, two hundred eighty-one thousand, one hundred sixty-eight".