857707 has 2 divisors, whose sum is σ = 857708. Its totient is φ = 857706.

The previous prime is 857687. The next prime is 857711. The reversal of 857707 is 707758.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 857707 - 2⁷ = 857579 is a prime.

It is a super-2 number, since 2×857707² = 1471322595698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (857737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428853 + 428854.

It is an arithmetic number, because the mean of its divisors is an integer number (428854).

2⁸⁵⁷⁷⁰⁷ is an apocalyptic number.

857707 is a deficient number, since it is larger than the sum of its proper divisors (1).

857707 is an equidigital number, since it uses as much as digits as its factorization.

857707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13720, while the sum is 34.

The square root of 857707 is about 926.1247216223. The cubic root of 857707 is about 95.0122606521.

The spelling of 857707 in words is "eight hundred fifty-seven thousand, seven hundred seven".