138005688 has 16 divisors (see below), whose sum is σ = 345014280. Its totient is φ = 46001888.

The previous prime is 138005687. The next prime is 138005689. The reversal of 138005688 is 886500831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138005687) and next prime (138005689).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138005687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2875095 + ... + 2875142.

Almost surely, 2^138005688 is an apocalyptic number.

It is an amenable number.

138005688 is an abundant number, since it is smaller than the sum of its proper divisors (207008592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138005688 is a wasteful number, since it uses less digits than its factorization.

138005688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5750246 (or 5750242 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 138005688 is about 11747.5822193335. The cubic root of 138005688 is about 516.7720250395.

The spelling of 138005688 in words is "one hundred thirty-eight million, five thousand, six hundred eighty-eight".