128395515 has 16 divisors (see below), whose sum is σ = 205574400. Its totient is φ = 68430432.

The previous prime is 128395511. The next prime is 128395523. The reversal of 128395515 is 515593821.

It is not a de Polignac number, because 128395515 - 2² = 128395511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128395511) 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 15 ways as a sum of consecutive naturals, for example, 37026 + ... + 40344.

It is an arithmetic number, because the mean of its divisors is an integer number (12848400).

Almost surely, 2^128395515 is an apocalyptic number.

128395515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128395515 is a deficient number, since it is larger than the sum of its proper divisors (77178885).

128395515 is a wasteful number, since it uses less digits than its factorization.

128395515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5906.

The product of its digits is 54000, while the sum is 39.

The square root of 128395515 is about 11331.1744757549. The cubic root of 128395515 is about 504.4869671378.

The spelling of 128395515 in words is "one hundred twenty-eight million, three hundred ninety-five thousand, five hundred fifteen".