138581788 has 6 divisors (see below), whose sum is σ = 242518136. Its totient is φ = 69290892.

The previous prime is 138581759. The next prime is 138581791. The reversal of 138581788 is 887185831.

138581788 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 as a sum of consecutive naturals, namely, 17322720 + ... + 17322727.

Almost surely, 2^138581788 is an apocalyptic number.

It is an amenable number.

138581788 is a deficient number, since it is larger than the sum of its proper divisors (103936348).

138581788 is a wasteful number, since it uses less digits than its factorization.

138581788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34645451 (or 34645449 counting only the distinct ones).

The product of its digits is 430080, while the sum is 49.

The square root of 138581788 is about 11772.0766222447. The cubic root of 138581788 is about 517.4901091095.

The spelling of 138581788 in words is "one hundred thirty-eight million, five hundred eighty-one thousand, seven hundred eighty-eight".