128443894 has 8 divisors (see below), whose sum is σ = 192762648. Its totient is φ = 64189680.

The previous prime is 128443883. The next prime is 128443901. The reversal of 128443894 is 498344821.

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

It is a super-4 number, since 4×128443894⁴ (a number of 34 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128443894.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10807 + ... + 19330.

It is an arithmetic number, because the mean of its divisors is an integer number (24095331).

Almost surely, 2^128443894 is an apocalyptic number.

128443894 is a deficient number, since it is larger than the sum of its proper divisors (64318754).

128443894 is a wasteful number, since it uses less digits than its factorization.

128443894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32270.

The product of its digits is 221184, while the sum is 43.

The square root of 128443894 is about 11333.3090489936. The cubic root of 128443894 is about 504.5503221809.

The spelling of 128443894 in words is "one hundred twenty-eight million, four hundred forty-three thousand, eight hundred ninety-four".