128388385 has 8 divisors (see below), whose sum is σ = 156177000. Its totient is φ = 101303424.

The previous prime is 128388373. The next prime is 128388413. The reversal of 128388385 is 583883821.

It can be written as a sum of positive squares in 4 ways, for example, as 57289761 + 71098624 = 7569^2 + 8432^2 .

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 128388385 - 2⁵ = 128388353 is a prime.

It is an unprimeable number.

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, 175510 + ... + 176239.

It is an arithmetic number, because the mean of its divisors is an integer number (19522125).

Almost surely, 2^128388385 is an apocalyptic number.

It is an amenable number.

128388385 is a deficient number, since it is larger than the sum of its proper divisors (27788615).

128388385 is an equidigital number, since it uses as much as digits as its factorization.

128388385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351827.

The product of its digits is 368640, while the sum is 46.

The square root of 128388385 is about 11330.8598526325. The cubic root of 128388385 is about 504.4776286530.

The spelling of 128388385 in words is "one hundred twenty-eight million, three hundred eighty-eight thousand, three hundred eighty-five".