9971857 has 16 divisors (see below), whose sum is σ = 11987712. Its totient is φ = 8110080.

The previous prime is 9971839. The next prime is 9971861. The reversal of 9971857 is 7581799.

9971857 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9971857 - 2⁷ = 9971729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9971807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38673 + ... + 38929.

It is an arithmetic number, because the mean of its divisors is an integer number (749232).

Almost surely, 2^9971857 is an apocalyptic number.

It is an amenable number.

9971857 is a deficient number, since it is larger than the sum of its proper divisors (2015855).

9971857 is a wasteful number, since it uses less digits than its factorization.

9971857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528.

The product of its digits is 158760, while the sum is 46.

The square root of 9971857 is about 3157.8247259783. The cubic root of 9971857 is about 215.2411715909.

The spelling of 9971857 in words is "nine million, nine hundred seventy-one thousand, eight hundred fifty-seven".