3978444789 has 96 divisors (see below), whose sum is σ = 6894720000. Its totient is φ = 2259148320.

The previous prime is 3978444719. The next prime is 3978444817. The reversal of 3978444789 is 9874448793.

3978444789 is a `hidden beast` number, since 39 + 7 + 84 + 447 + 89 = 666.

It is not a de Polignac number, because 3978444789 - 2¹² = 3978440693 is a prime.

Its product of digits (48771072) is a multiple of the sum of its prime factors (756).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978444719) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6641512 + ... + 6642110.

It is an arithmetic number, because the mean of its divisors is an integer number (71820000).

Almost surely, 2^3978444789 is an apocalyptic number.

It is an amenable number.

3978444789 is a deficient number, since it is larger than the sum of its proper divisors (2916275211).

3978444789 is a wasteful number, since it uses less digits than its factorization.

3978444789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756 (or 739 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 63.

The square root of 3978444789 is about 63074.9141022007. The cubic root of 3978444789 is about 1584.5445176556.

The spelling of 3978444789 in words is "three billion, nine hundred seventy-eight million, four hundred forty-four thousand, seven hundred eighty-nine".