3947789391660 has 288 divisors, whose sum is σ = 12355670815488. Its totient is φ = 1019711669760.

The previous prime is 3947789391659. The next prime is 3947789391661. The reversal of 3947789391660 is 661939877493.

3947789391660 is a `hidden beast` number, since 3 + 9 + 477 + 8 + 9 + 3 + 91 + 6 + 60 = 666.

It is an interprime number because it is at equal distance from previous prime (3947789391659) and next prime (3947789391661).

It is not an unprimeable number, because it can be changed into a prime (3947789391661) 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, 619452234 + ... + 619458606.

It is an arithmetic number, because the mean of its divisors is an integer number (42901634776).

Almost surely, 2^{3947789391660} is an apocalyptic number.

3947789391660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3947789391660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6177835407744).

3947789391660 is an abundant number, since it is smaller than the sum of its proper divisors (8407881423828).

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

3947789391660 is a wasteful number, since it uses less digits than its factorization.

3947789391660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7085 (or 7080 counting only the distinct ones).

The product of its (nonzero) digits is 370355328, while the sum is 72.

The spelling of 3947789391660 in words is "three trillion, nine hundred forty-seven billion, seven hundred eighty-nine million, three hundred ninety-one thousand, six hundred sixty".