138439168 has 120 divisors (see below), whose sum is σ = 336755232. Its totient is φ = 55683072.

The previous prime is 138439157. The next prime is 138439199. The reversal of 138439168 is 861934831.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1293771 + ... + 1293877.

Almost surely, 2^138439168 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 138439168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168377616).

138439168 is an abundant number, since it is smaller than the sum of its proper divisors (198316064).

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

138439168 is an equidigital number, since it uses as much as digits as its factorization.

138439168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 135 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 138439168 is about 11766.0175080611. The cubic root of 138439168 is about 517.3125249953.

The spelling of 138439168 in words is "one hundred thirty-eight million, four hundred thirty-nine thousand, one hundred sixty-eight".