128843986 has 8 divisors (see below), whose sum is σ = 204634620. Its totient is φ = 60632448.

The previous prime is 128843977. The next prime is 128843989. The reversal of 128843986 is 689348821.

It can be written as a sum of positive squares in 2 ways, for example, as 121418361 + 7425625 = 11019^2 + 2725^2 .

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

It is not an unprimeable number, because it can be changed into a prime (128843989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1894731 + ... + 1894798.

Almost surely, 2^128843986 is an apocalyptic number.

128843986 is a deficient number, since it is larger than the sum of its proper divisors (75790634).

128843986 is a wasteful number, since it uses less digits than its factorization.

128843986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789548.

The product of its digits is 663552, while the sum is 49.

The square root of 128843986 is about 11350.9464803601. The cubic root of 128843986 is about 505.0736565439.

The spelling of 128843986 in words is "one hundred twenty-eight million, eight hundred forty-three thousand, nine hundred eighty-six".