2106857 has 2 divisors, whose sum is σ = 2106858. Its totient is φ = 2106856.

The previous prime is 2106847. The next prime is 2106877. The reversal of 2106857 is 7586012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2019241 + 87616 = 1421^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 2106857 - 2¹⁰ = 2105833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2106847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053428 + 1053429.

It is an arithmetic number, because the mean of its divisors is an integer number (1053429).

2^2106857 is an apocalyptic number.

It is an amenable number.

2106857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106857 is an equidigital number, since it uses as much as digits as its factorization.

2106857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 2106857 is about 1451.5016362375. The cubic root of 2106857 is about 128.1971449330.

The spelling of 2106857 in words is "two million, one hundred six thousand, eight hundred fifty-seven".