856289 has 4 divisors (see below), whose sum is σ = 978624. Its totient is φ = 733956.

The previous prime is 856279. The next prime is 856301. The reversal of 856289 is 982658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982658 = 2 ⋅491329.

It is a cyclic number.

It is not a de Polignac number, because 856289 - 2¹⁶ = 790753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856249) 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, 61157 + ... + 61170.

It is an arithmetic number, because the mean of its divisors is an integer number (244656).

2⁸⁵⁶²⁸⁹ is an apocalyptic number.

It is an amenable number.

856289 is a deficient number, since it is larger than the sum of its proper divisors (122335).

856289 is a wasteful number, since it uses less digits than its factorization.

856289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122334.

The product of its digits is 34560, while the sum is 38.

The square root of 856289 is about 925.3588493120. The cubic root of 856289 is about 94.9598722492.

The spelling of 856289 in words is "eight hundred fifty-six thousand, two hundred eighty-nine".