138867444 has 18 divisors (see below), whose sum is σ = 351026130. Its totient is φ = 46289136.

The previous prime is 138867433. The next prime is 138867497. The reversal of 138867444 is 444768831.

138867444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 129686544 + 9180900 = 11388^2 + 3030^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 138867444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1928679 + ... + 1928750.

Almost surely, 2^138867444 is an apocalyptic number.

It is an amenable number.

138867444 is an abundant number, since it is smaller than the sum of its proper divisors (212158686).

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

138867444 is a wasteful number, since it uses less digits than its factorization.

138867444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3857439 (or 3857434 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 138867444 is about 11784.2031550716. The cubic root of 138867444 is about 517.8454292514.

The spelling of 138867444 in words is "one hundred thirty-eight million, eight hundred sixty-seven thousand, four hundred forty-four".