3947081221888 has 72 divisors (see below), whose sum is σ = 9041954826240. Its totient is φ = 1684528204800.

The previous prime is 3947081221877. The next prime is 3947081221901. The reversal of 3947081221888 is 8881221807493.

It is a congruent number.

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, 4179688 + ... + 5036263.

It is an arithmetic number, because the mean of its divisors is an integer number (125582705920).

Almost surely, 2^{3947081221888} is an apocalyptic number.

It is an amenable number.

3947081221888 is an abundant number, since it is smaller than the sum of its proper divisors (5094873604352).

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

3947081221888 is an equidigital number, since it uses as much as digits as its factorization.

3947081221888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9216213 (or 9216199 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 61.

The spelling of 3947081221888 in words is "three trillion, nine hundred forty-seven billion, eighty-one million, two hundred twenty-one thousand, eight hundred eighty-eight".