856443 has 16 divisors (see below), whose sum is σ = 1382400. Its totient is φ = 460416.

The previous prime is 856441. The next prime is 856459. The reversal of 856443 is 344658.

It is not a de Polignac number, because 856443 - 2¹ = 856441 is a prime.

It is a super-2 number, since 2×856443² = 1466989224498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 856443.

It is not an unprimeable number, because it can be changed into a prime (856441) 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 15 ways as a sum of consecutive naturals, for example, 843 + ... + 1556.

It is an arithmetic number, because the mean of its divisors is an integer number (86400).

2⁸⁵⁶⁴⁴³ is an apocalyptic number.

856443 is a deficient number, since it is larger than the sum of its proper divisors (525957).

856443 is a wasteful number, since it uses less digits than its factorization.

856443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426.

The product of its digits is 11520, while the sum is 30.

The square root of 856443 is about 925.4420565330. The cubic root of 856443 is about 94.9655646201.

The spelling of 856443 in words is "eight hundred fifty-six thousand, four hundred forty-three".