857579 has 2 divisors, whose sum is σ = 857580. Its totient is φ = 857578.

The previous prime is 857573. The next prime is 857581. The reversal of 857579 is 975758.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-857579 is a prime.

Together with 857581, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (857573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428789 + 428790.

It is an arithmetic number, because the mean of its divisors is an integer number (428790).

2⁸⁵⁷⁵⁷⁹ is an apocalyptic number.

857579 is a deficient number, since it is larger than the sum of its proper divisors (1).

857579 is an equidigital number, since it uses as much as digits as its factorization.

857579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 41.

The square root of 857579 is about 926.0556138807. The cubic root of 857579 is about 95.0075340285.

The spelling of 857579 in words is "eight hundred fifty-seven thousand, five hundred seventy-nine".