128409193 has 12 divisors (see below), whose sum is σ = 143544240. Its totient is φ = 114750680.

The previous prime is 128409179. The next prime is 128409199. The reversal of 128409193 is 391904821.

It is not a de Polignac number, because 128409193 - 2⁹ = 128408681 is a prime.

It is a super-2 number, since 2×128409193² = 32977841693822498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128409199) 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 11 ways as a sum of consecutive naturals, for example, 1855 + ... + 16132.

It is an arithmetic number, because the mean of its divisors is an integer number (11962020).

Almost surely, 2^128409193 is an apocalyptic number.

It is an amenable number.

128409193 is a deficient number, since it is larger than the sum of its proper divisors (15135047).

128409193 is a wasteful number, since it uses less digits than its factorization.

128409193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18068 (or 18057 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 128409193 is about 11331.7780158279. The cubic root of 128409193 is about 504.5048808676.

The spelling of 128409193 in words is "one hundred twenty-eight million, four hundred nine thousand, one hundred ninety-three".