3891947056 has 10 divisors (see below), whose sum is σ = 7540647452. Its totient is φ = 1945973520.

The previous prime is 3891947027. The next prime is 3891947069. The reversal of 3891947056 is 6507491983.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 3891946994 and 3891947012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121623330 + ... + 121623361.

Almost surely, 2^3891947056 is an apocalyptic number.

It is an amenable number.

3891947056 is a deficient number, since it is larger than the sum of its proper divisors (3648700396).

3891947056 is a wasteful number, since it uses less digits than its factorization.

3891947056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243246699 (or 243246693 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 3891947056 is about 62385.4715138068. The cubic root of 3891947056 is about 1572.9767662873.

The spelling of 3891947056 in words is "three billion, eight hundred ninety-one million, nine hundred forty-seven thousand, fifty-six".