3947818608 has 240 divisors, whose sum is σ = 12193941760. Its totient is φ = 1222511616.

The previous prime is 3947818603. The next prime is 3947818621. The reversal of 3947818608 is 8068187493.

3947818608 is a `hidden beast` number, since 394 + 78 + 186 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3947818603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12859191 + ... + 12859497.

Almost surely, 2^3947818608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3947818608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6096970880).

3947818608 is an abundant number, since it is smaller than the sum of its proper divisors (8246123152).

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

3947818608 is a wasteful number, since it uses less digits than its factorization.

3947818608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 3947818608 is about 62831.6688302961. The cubic root of 3947818608 is about 1580.4680832872.

The spelling of 3947818608 in words is "three billion, nine hundred forty-seven million, eight hundred eighteen thousand, six hundred eight".