138899688 has 64 divisors (see below), whose sum is σ = 355492800. Its totient is φ = 45212160.

The previous prime is 138899669. The next prime is 138899689. The reversal of 138899688 is 886998831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138899689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 329718 + ... + 330138.

It is an arithmetic number, because the mean of its divisors is an integer number (5554575).

Almost surely, 2^138899688 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 138899688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177746400).

138899688 is an abundant number, since it is smaller than the sum of its proper divisors (216593112).

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

138899688 is a wasteful number, since it uses less digits than its factorization.

138899688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722 (or 718 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 60.

The square root of 138899688 is about 11785.5711783519. The cubic root of 138899688 is about 517.8855061174.

The spelling of 138899688 in words is "one hundred thirty-eight million, eight hundred ninety-nine thousand, six hundred eighty-eight".