3885128217 has 24 divisors (see below), whose sum is σ = 5753171424. Its totient is φ = 2525088384.

The previous prime is 3885128213. The next prime is 3885128321. The reversal of 3885128217 is 7128215883.

3885128217 is a `hidden beast` number, since 388 + 51 + 2 + 8 + 217 = 666.

3885128217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3885128217 - 2² = 3885128213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3885128213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202513 + ... + 220865.

It is an arithmetic number, because the mean of its divisors is an integer number (239715476).

Almost surely, 2^3885128217 is an apocalyptic number.

It is an amenable number.

3885128217 is a deficient number, since it is larger than the sum of its proper divisors (1868043207).

3885128217 is a wasteful number, since it uses less digits than its factorization.

3885128217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18949 (or 18946 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 3885128217 is about 62330.7966979406. The cubic root of 3885128217 is about 1572.0575909305.

The spelling of 3885128217 in words is "three billion, eight hundred eighty-five million, one hundred twenty-eight thousand, two hundred seventeen".