2166857 has 16 divisors (see below), whose sum is σ = 2737152. Its totient is φ = 1666320.

The previous prime is 2166833. The next prime is 2166877. The reversal of 2166857 is 7586612.

It is a cyclic number.

It is not a de Polignac number, because 2166857 - 2⁸ = 2166601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166877) 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, 8108 + ... + 8370.

It is an arithmetic number, because the mean of its divisors is an integer number (171072).

2^2166857 is an apocalyptic number.

It is an amenable number.

2166857 is a deficient number, since it is larger than the sum of its proper divisors (570295).

2166857 is a wasteful number, since it uses less digits than its factorization.

2166857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388.

The product of its digits is 20160, while the sum is 35.

The square root of 2166857 is about 1472.0247959868. The cubic root of 2166857 is about 129.4027235662.

The spelling of 2166857 in words is "two million, one hundred sixty-six thousand, eight hundred fifty-seven".