128397805 has 8 divisors (see below), whose sum is σ = 154155744. Its totient is φ = 102666000.

The previous prime is 128397803. The next prime is 128397809. The reversal of 128397805 is 508793821.

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

It is not a de Polignac number, because 128397805 - 2¹ = 128397803 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 (128397803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6730 + ... + 17380.

It is an arithmetic number, because the mean of its divisors is an integer number (19269468).

Almost surely, 2^128397805 is an apocalyptic number.

It is an amenable number.

128397805 is a deficient number, since it is larger than the sum of its proper divisors (25757939).

128397805 is a wasteful number, since it uses less digits than its factorization.

128397805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13067.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 128397805 is about 11331.2755239646. The cubic root of 128397805 is about 504.4899663814.

The spelling of 128397805 in words is "one hundred twenty-eight million, three hundred ninety-seven thousand, eight hundred five".