3994446640 has 40 divisors (see below), whose sum is σ = 9294873840. Its totient is φ = 1596439296.

The previous prime is 3994446613. The next prime is 3994446671. The reversal of 3994446640 is 466444993.

3994446640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78007 + ... + 118633.

It is an arithmetic number, because the mean of its divisors is an integer number (232371846).

Almost surely, 2^3994446640 is an apocalyptic number.

It is an amenable number.

3994446640 is an abundant number, since it is smaller than the sum of its proper divisors (5300427200).

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

3994446640 is a wasteful number, since it uses less digits than its factorization.

3994446640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41869 (or 41863 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 49.

The square root of 3994446640 is about 63201.6347889831. The cubic root of 3994446640 is about 1586.6660942806. Note that the first 3 decimals are identical.

The spelling of 3994446640 in words is "three billion, nine hundred ninety-four million, four hundred forty-six thousand, six hundred forty".