138744841 has 3 divisors (see below), whose sum is σ = 138756621. Its totient is φ = 138733062.

The previous prime is 138744829. The next prime is 138744847. The reversal of 138744841 is 148447831.

It is a happy number.

The square root of 138744841 is 11779.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 138744841 - 2¹³ = 138736649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138744794 and 138744803.

It is not an unprimeable number, because it can be changed into a prime (138744847) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5890 + ... + 17668.

It is an arithmetic number, because the mean of its divisors is an integer number (46252207).

Almost surely, 2^138744841 is an apocalyptic number.

138744841 is the 11779-th square number.

138744841 is the 5890-th centered octagonal number.

It is an amenable number.

138744841 is a deficient number, since it is larger than the sum of its proper divisors (11780).

138744841 is an frugal number, since it uses more digits than its factorization.

138744841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23558 (or 11779 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The cubic root of 138744841 is about 517.6929862814.

The spelling of 138744841 in words is "one hundred thirty-eight million, seven hundred forty-four thousand, eight hundred forty-one".