138589439 has 8 divisors (see below), whose sum is σ = 145997040. Its totient is φ = 131193216.

The previous prime is 138589427. The next prime is 138589441. The reversal of 138589439 is 934985831.

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 138589439 - 2⁸ = 138589183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138589939) 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, 35639 + ... + 39335.

It is an arithmetic number, because the mean of its divisors is an integer number (18249630).

Almost surely, 2^138589439 is an apocalyptic number.

138589439 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138589439 is a deficient number, since it is larger than the sum of its proper divisors (7407601).

138589439 is a wasteful number, since it uses less digits than its factorization.

138589439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5689.

The product of its digits is 933120, while the sum is 50.

The square root of 138589439 is about 11772.4015816655. The cubic root of 138589439 is about 517.4996323521.

The spelling of 138589439 in words is "one hundred thirty-eight million, five hundred eighty-nine thousand, four hundred thirty-nine".