3921127857 has 12 divisors (see below), whose sum is σ = 5688805200. Its totient is φ = 2602568088.

The previous prime is 3921127853. The next prime is 3921127871. The reversal of 3921127857 is 7587211293.

It is not a de Polignac number, because 3921127857 - 2² = 3921127853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3921127853) 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 11 ways as a sum of consecutive naturals, for example, 957607 + ... + 961692.

It is an arithmetic number, because the mean of its divisors is an integer number (474067100).

Almost surely, 2^3921127857 is an apocalyptic number.

It is an amenable number.

3921127857 is a deficient number, since it is larger than the sum of its proper divisors (1767677343).

3921127857 is a wasteful number, since it uses less digits than its factorization.

3921127857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919532 (or 1919529 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 3921127857 is about 62618.9097397903. The cubic root of 3921127857 is about 1576.8982379485.

The spelling of 3921127857 in words is "three billion, nine hundred twenty-one million, one hundred twenty-seven thousand, eight hundred fifty-seven".