128443447 has 16 divisors (see below), whose sum is σ = 148184064. Its totient is φ = 110232000.

The previous prime is 128443429. The next prime is 128443453. The reversal of 128443447 is 744344821.

It is a cyclic number.

It is not a de Polignac number, because 128443447 - 2¹¹ = 128441399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128443457) 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, 9388 + ... + 18574.

It is an arithmetic number, because the mean of its divisors is an integer number (9261504).

Almost surely, 2^128443447 is an apocalyptic number.

128443447 is a deficient number, since it is larger than the sum of its proper divisors (19740617).

128443447 is a wasteful number, since it uses less digits than its factorization.

128443447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9270.

The product of its digits is 86016, while the sum is 37.

The square root of 128443447 is about 11333.2893283459. The cubic root of 128443447 is about 504.5497368819.

The spelling of 128443447 in words is "one hundred twenty-eight million, four hundred forty-three thousand, four hundred forty-seven".