138533844 has 24 divisors (see below), whose sum is σ = 324701440. Its totient is φ = 45969984.

The previous prime is 138533821. The next prime is 138533849. The reversal of 138533844 is 448335831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138533849) 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 7 ways as a sum of consecutive naturals, for example, 23209 + ... + 28560.

Almost surely, 2^138533844 is an apocalyptic number.

It is an amenable number.

138533844 is an abundant number, since it is smaller than the sum of its proper divisors (186167596).

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

138533844 is a wasteful number, since it uses less digits than its factorization.

138533844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51999 (or 51997 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 138533844 is about 11770.0401018858. The cubic root of 138533844 is about 517.4304249623.

The spelling of 138533844 in words is "one hundred thirty-eight million, five hundred thirty-three thousand, eight hundred forty-four".