128188913 has 8 divisors (see below), whose sum is σ = 134199936. Its totient is φ = 122214400.

The previous prime is 128188901. The next prime is 128188939. The reversal of 128188913 is 319881821.

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 128188913 - 2²⁰ = 127140337 is a prime.

It is a super-2 number, since 2×128188913² = 32864794832243138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128188513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1808 + ... + 16113.

It is an arithmetic number, because the mean of its divisors is an integer number (16774992).

Almost surely, 2^128188913 is an apocalyptic number.

It is an amenable number.

128188913 is a deficient number, since it is larger than the sum of its proper divisors (6011023).

128188913 is a wasteful number, since it uses less digits than its factorization.

128188913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18255.

The product of its digits is 27648, while the sum is 41.

The square root of 128188913 is about 11322.0542747330. The cubic root of 128188913 is about 504.2162308610.

The spelling of 128188913 in words is "one hundred twenty-eight million, one hundred eighty-eight thousand, nine hundred thirteen".