3978620388 has 36 divisors (see below), whose sum is σ = 10133851728. Its totient is φ = 1316081520.

The previous prime is 3978620369. The next prime is 3978620389. The reversal of 3978620388 is 8830268793.

3978620388 is a `hidden beast` number, since 3 + 9 + 7 + 8 + 620 + 3 + 8 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (3978620389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 417106 + ... + 426537.

Almost surely, 2^3978620388 is an apocalyptic number.

It is an amenable number.

3978620388 is an abundant number, since it is smaller than the sum of its proper divisors (6155231340).

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

3978620388 is a wasteful number, since it uses less digits than its factorization.

3978620388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843784 (or 843779 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 3978620388 is about 63076.3060744682. The cubic root of 3978620388 is about 1584.5678299761.

The spelling of 3978620388 in words is "three billion, nine hundred seventy-eight million, six hundred twenty thousand, three hundred eighty-eight".