138656788 has 12 divisors (see below), whose sum is σ = 253199520. Its totient is φ = 66314072.

The previous prime is 138656773. The next prime is 138656789. The reversal of 138656788 is 887656831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138656789) by changing a digit.

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, 753478 + ... + 753661.

It is an arithmetic number, because the mean of its divisors is an integer number (21099960).

Almost surely, 2^138656788 is an apocalyptic number.

It is an amenable number.

138656788 is a deficient number, since it is larger than the sum of its proper divisors (114542732).

138656788 is a wasteful number, since it uses less digits than its factorization.

138656788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507166 (or 1507164 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The square root of 138656788 is about 11775.2616956057. The cubic root of 138656788 is about 517.5834469120.

The spelling of 138656788 in words is "one hundred thirty-eight million, six hundred fifty-six thousand, seven hundred eighty-eight".