138642608 has 40 divisors (see below), whose sum is σ = 290221008. Its totient is φ = 63781632.

The previous prime is 138642587. The next prime is 138642617. The reversal of 138642608 is 806246831.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76691 + ... + 78477.

Almost surely, 2^138642608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138642608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145110504).

138642608 is an abundant number, since it is smaller than the sum of its proper divisors (151578400).

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

138642608 is a wasteful number, since it uses less digits than its factorization.

138642608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181 (or 2175 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 138642608 is about 11774.6595704504. The cubic root of 138642608 is about 517.5658024255.

The spelling of 138642608 in words is "one hundred thirty-eight million, six hundred forty-two thousand, six hundred eight".