857089 has 4 divisors (see below), whose sum is σ = 907524. Its totient is φ = 806656.

The previous prime is 857083. The next prime is 857099. The reversal of 857089 is 980758.

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

It can be written as a sum of positive squares in 2 ways, for example, as 478864 + 378225 = 692^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 857089 - 2³ = 857081 is a prime.

It is a Duffinian number.

857089 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (857081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25192 + ... + 25225.

It is an arithmetic number, because the mean of its divisors is an integer number (226881).

It is a Proth number, since it is equal to 837 ⋅ 2¹⁰ + 1 and 837 < 2¹⁰.

2⁸⁵⁷⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

857089 is a deficient number, since it is larger than the sum of its proper divisors (50435).

857089 is a wasteful number, since it uses less digits than its factorization.

857089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50434.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 857089 is about 925.7910131342. The cubic root of 857089 is about 94.9894355750.

The spelling of 857089 in words is "eight hundred fifty-seven thousand, eighty-nine".