785857 has 2 divisors, whose sum is σ = 785858. Its totient is φ = 785856.

The previous prime is 785839. The next prime is 785861. The reversal of 785857 is 758587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638401 + 147456 = 799^2 + 384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-785857 is a prime.

It is not a weakly prime, because it can be changed into another prime (785357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 392928 + 392929.

It is an arithmetic number, because the mean of its divisors is an integer number (392929).

2⁷⁸⁵⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

785857 is a deficient number, since it is larger than the sum of its proper divisors (1).

785857 is an equidigital number, since it uses as much as digits as its factorization.

785857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78400, while the sum is 40.

The square root of 785857 is about 886.4857584868. The cubic root of 785857 is about 92.2814709888.

The spelling of 785857 in words is "seven hundred eighty-five thousand, eight hundred fifty-seven".