138588605 has 8 divisors (see below), whose sum is σ = 166628664. Its totient is φ = 110656000.

The previous prime is 138588601. The next prime is 138588661. The reversal of 138588605 is 506885831.

It can be written as a sum of positive squares in 4 ways, for example, as 17522596 + 121066009 = 4186^2 + 11003^2 .

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

It is not a de Polignac number, because 138588605 - 2² = 138588601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138588601) 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, 23996 + ... + 29205.

It is an arithmetic number, because the mean of its divisors is an integer number (20828583).

Almost surely, 2^138588605 is an apocalyptic number.

It is an amenable number.

138588605 is a deficient number, since it is larger than the sum of its proper divisors (28040059).

138588605 is an equidigital number, since it uses as much as digits as its factorization.

138588605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53727.

The product of its (nonzero) digits is 230400, while the sum is 44.

The square root of 138588605 is about 11772.3661597828. The cubic root of 138588605 is about 517.4985942847.

The spelling of 138588605 in words is "one hundred thirty-eight million, five hundred eighty-eight thousand, six hundred five".