138484639 has 8 divisors (see below), whose sum is σ = 141990992. Its totient is φ = 134991360.

The previous prime is 138484631. The next prime is 138484651. The reversal of 138484639 is 936484831.

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 138484639 - 2³ = 138484631 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 (138484631) 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, 20287 + ... + 26239.

It is an arithmetic number, because the mean of its divisors is an integer number (17748874).

Almost surely, 2^138484639 is an apocalyptic number.

138484639 is a deficient number, since it is larger than the sum of its proper divisors (3506353).

138484639 is an equidigital number, since it uses as much as digits as its factorization.

138484639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6537.

The product of its digits is 497664, while the sum is 46.

The square root of 138484639 is about 11767.9496514898. The cubic root of 138484639 is about 517.3691567112.

The spelling of 138484639 in words is "one hundred thirty-eight million, four hundred eighty-four thousand, six hundred thirty-nine".