138544868 has 24 divisors (see below), whose sum is σ = 302280384. Its totient is φ = 53978400.

The previous prime is 138544867. The next prime is 138544871. The reversal of 138544868 is 868445831.

138544868 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (138544867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224603 + ... + 225218.

It is an arithmetic number, because the mean of its divisors is an integer number (12595016).

Almost surely, 2^138544868 is an apocalyptic number.

It is an amenable number.

138544868 is an abundant number, since it is smaller than the sum of its proper divisors (163735516).

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

138544868 is a wasteful number, since it uses less digits than its factorization.

138544868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449843 (or 449841 counting only the distinct ones).

The product of its digits is 737280, while the sum is 47.

The square root of 138544868 is about 11770.5084002349. The cubic root of 138544868 is about 517.4441496511. Note that the first 3 decimals are identical.

The spelling of 138544868 in words is "one hundred thirty-eight million, five hundred forty-four thousand, eight hundred sixty-eight".