84128841 has 8 divisors (see below), whose sum is σ = 124635360. Its totient is φ = 56085876.

The previous prime is 84128833. The next prime is 84128873. The reversal of 84128841 is 14882148.

It is a happy number.

It is not a de Polignac number, because 84128841 - 2³ = 84128833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84128796 and 84128805.

It is not an unprimeable number, because it can be changed into a prime (84128881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1557915 + ... + 1557968.

It is an arithmetic number, because the mean of its divisors is an integer number (15579420).

Almost surely, 2^84128841 is an apocalyptic number.

It is an amenable number.

84128841 is a deficient number, since it is larger than the sum of its proper divisors (40506519).

84128841 is a wasteful number, since it uses less digits than its factorization.

84128841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3115892 (or 3115886 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 84128841 is about 9172.1775495244. The cubic root of 84128841 is about 438.1757129487.

The spelling of 84128841 in words is "eighty-four million, one hundred twenty-eight thousand, eight hundred forty-one".