138795688 has 8 divisors (see below), whose sum is σ = 260241930. Its totient is φ = 69397840.

The previous prime is 138795673. The next prime is 138795691. The reversal of 138795688 is 886597831.

It can be written as a sum of positive squares in only one way, i.e., 92582884 + 46212804 = 9622^2 + 6798^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-4 number, since 4×138795688⁴ (a number of 34 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8674723 + ... + 8674738.

Almost surely, 2^138795688 is an apocalyptic number.

It is an amenable number.

138795688 is a deficient number, since it is larger than the sum of its proper divisors (121446242).

138795688 is a wasteful number, since it uses less digits than its factorization.

138795688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17349467 (or 17349463 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 55.

The square root of 138795688 is about 11781.1581773610. The cubic root of 138795688 is about 517.7562196723.

The spelling of 138795688 in words is "one hundred thirty-eight million, seven hundred ninety-five thousand, six hundred eighty-eight".