128418609 has 16 divisors (see below), whose sum is σ = 187686144. Its totient is φ = 77456400.

The previous prime is 128418599. The next prime is 128418613. The reversal of 128418609 is 906814821.

It is not a de Polignac number, because 128418609 - 2⁹ = 128418097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128418809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2259 + ... + 16184.

It is an arithmetic number, because the mean of its divisors is an integer number (11730384).

Almost surely, 2^128418609 is an apocalyptic number.

It is an amenable number.

128418609 is a deficient number, since it is larger than the sum of its proper divisors (59267535).

128418609 is a wasteful number, since it uses less digits than its factorization.

128418609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18668.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 128418609 is about 11332.1934769929. The cubic root of 128418609 is about 504.5172120249.

The spelling of 128418609 in words is "one hundred twenty-eight million, four hundred eighteen thousand, six hundred nine".