128138005 has 8 divisors (see below), whose sum is σ = 154173600. Its totient is φ = 102238416.

The previous prime is 128137981. The next prime is 128138009. The reversal of 128138005 is 500831821.

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 128138005 - 2²¹ = 126040853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128138009) 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, 31915 + ... + 35704.

It is an arithmetic number, because the mean of its divisors is an integer number (19271700).

Almost surely, 2^128138005 is an apocalyptic number.

It is an amenable number.

128138005 is a deficient number, since it is larger than the sum of its proper divisors (26035595).

128138005 is an equidigital number, since it uses as much as digits as its factorization.

128138005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68003.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 128138005 is about 11319.8058728938. The cubic root of 128138005 is about 504.1494751175.

Adding to 128138005 its reverse (500831821), we get a palindrome (628969826).

The spelling of 128138005 in words is "one hundred twenty-eight million, one hundred thirty-eight thousand, five".