857899 has 4 divisors (see below), whose sum is σ = 980464. Its totient is φ = 735336.

The previous prime is 857897. The next prime is 857903. The reversal of 857899 is 998758.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 857899 - 2¹ = 857897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857897) 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 in 3 ways as a sum of consecutive naturals, for example, 61272 + ... + 61285.

It is an arithmetic number, because the mean of its divisors is an integer number (245116).

2⁸⁵⁷⁸⁹⁹ is an apocalyptic number.

857899 is a deficient number, since it is larger than the sum of its proper divisors (122565).

857899 is a wasteful number, since it uses less digits than its factorization.

857899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122564.

The product of its digits is 181440, while the sum is 46.

The square root of 857899 is about 926.2283735667. The cubic root of 857899 is about 95.0193497058.

The spelling of 857899 in words is "eight hundred fifty-seven thousand, eight hundred ninety-nine".