3994420128 has 24 divisors (see below), whose sum is σ = 10485353088. Its totient is φ = 1331473344.

The previous prime is 3994420127. The next prime is 3994420151. The reversal of 3994420128 is 8210244993.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 3994420128.

It is not an unprimeable number, because it can be changed into a prime (3994420123) 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 3 ways as a sum of consecutive naturals, for example, 20804176 + ... + 20804367.

It is an arithmetic number, because the mean of its divisors is an integer number (436889712).

Almost surely, 2^3994420128 is an apocalyptic number.

It is an amenable number.

3994420128 is an abundant number, since it is smaller than the sum of its proper divisors (6490932960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3994420128 is a wasteful number, since it uses less digits than its factorization.

3994420128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41608556 (or 41608548 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 3994420128 is about 63201.4250472250. The cubic root of 3994420128 is about 1586.6625839250.

The spelling of 3994420128 in words is "three billion, nine hundred ninety-four million, four hundred twenty thousand, one hundred twenty-eight".