849857 has 2 divisors, whose sum is σ = 849858. Its totient is φ = 849856.

The previous prime is 849839. The next prime is 849869. The reversal of 849857 is 758948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 790321 + 59536 = 889^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 849857 - 2⁸ = 849601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (842857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424928 + 424929.

It is an arithmetic number, because the mean of its divisors is an integer number (424929).

2⁸⁴⁹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

849857 is a deficient number, since it is larger than the sum of its proper divisors (1).

849857 is an equidigital number, since it uses as much as digits as its factorization.

849857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 41.

The square root of 849857 is about 921.8768898286. The cubic root of 849857 is about 94.7215112890.

Subtracting from 849857 its reverse (758948), we obtain a palindrome (90909).

The spelling of 849857 in words is "eight hundred forty-nine thousand, eight hundred fifty-seven".