138836444 has 6 divisors (see below), whose sum is σ = 242963784. Its totient is φ = 69418220.

The previous prime is 138836419. The next prime is 138836447. The reversal of 138836444 is 444638831.

138836444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138836447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17354552 + ... + 17354559.

It is an arithmetic number, because the mean of its divisors is an integer number (40493964).

Almost surely, 2^138836444 is an apocalyptic number.

It is an amenable number.

138836444 is a deficient number, since it is larger than the sum of its proper divisors (104127340).

138836444 is a wasteful number, since it uses less digits than its factorization.

138836444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34709115 (or 34709113 counting only the distinct ones).

The product of its digits is 221184, while the sum is 41.

The square root of 138836444 is about 11782.8877614955. The cubic root of 138836444 is about 517.8068927340.

It can be divided in two parts, 1388364 and 44, that multiplied together give a palindrome (61088016).

The spelling of 138836444 in words is "one hundred thirty-eight million, eight hundred thirty-six thousand, four hundred forty-four".