138449839 has 8 divisors (see below), whose sum is σ = 152190720. Its totient is φ = 124901400.

The previous prime is 138449821. The next prime is 138449851. The reversal of 138449839 is 938944831.

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 138449839 - 2⁵ = 138449807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138449792 and 138449801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138449869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46599 + ... + 49480.

It is an arithmetic number, because the mean of its divisors is an integer number (19023840).

Almost surely, 2^138449839 is an apocalyptic number.

138449839 is a deficient number, since it is larger than the sum of its proper divisors (13740881).

138449839 is a wasteful number, since it uses less digits than its factorization.

138449839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96221.

The product of its digits is 746496, while the sum is 49.

The square root of 138449839 is about 11766.4709662668. The cubic root of 138449839 is about 517.3258162726.

The spelling of 138449839 in words is "one hundred thirty-eight million, four hundred forty-nine thousand, eight hundred thirty-nine".