128389893 has 8 divisors (see below), whose sum is σ = 171270528. Its totient is φ = 85551264.

The previous prime is 128389867. The next prime is 128389907. The reversal of 128389893 is 398983821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128389893 - 2⁵ = 128389861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128389813) by changing a digit.

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, 2496 + ... + 16217.

It is an arithmetic number, because the mean of its divisors is an integer number (21408816).

Almost surely, 2^128389893 is an apocalyptic number.

It is an amenable number.

128389893 is a deficient number, since it is larger than the sum of its proper divisors (42880635).

128389893 is a wasteful number, since it uses less digits than its factorization.

128389893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21003.

The product of its digits is 746496, while the sum is 51.

The square root of 128389893 is about 11330.9263963720. The cubic root of 128389893 is about 504.4796037779.

The spelling of 128389893 in words is "one hundred twenty-eight million, three hundred eighty-nine thousand, eight hundred ninety-three".