138443839 has 8 divisors (see below), whose sum is σ = 142037280. Its totient is φ = 134860800.

The previous prime is 138443807. The next prime is 138443863. The reversal of 138443839 is 938344831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138443839 - 2⁵ = 138443807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138443795 and 138443804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138441839) 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, 29334 + ... + 33724.

It is an arithmetic number, because the mean of its divisors is an integer number (17754660).

Almost surely, 2^138443839 is an apocalyptic number.

138443839 is a deficient number, since it is larger than the sum of its proper divisors (3593441).

138443839 is an equidigital number, since it uses as much as digits as its factorization.

138443839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5201.

The product of its digits is 248832, while the sum is 43.

The square root of 138443839 is about 11766.2160017569. The cubic root of 138443839 is about 517.3183430492.

The spelling of 138443839 in words is "one hundred thirty-eight million, four hundred forty-three thousand, eight hundred thirty-nine".