856445 has 8 divisors (see below), whose sum is σ = 1038336. Its totient is φ = 678096.

The previous prime is 856441. The next prime is 856459. The reversal of 856445 is 544658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856445 - 2² = 856441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 317 + ... + 1346.

It is an arithmetic number, because the mean of its divisors is an integer number (129792).

2⁸⁵⁶⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

856445 is a deficient number, since it is larger than the sum of its proper divisors (181891).

856445 is a wasteful number, since it uses less digits than its factorization.

856445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771.

The product of its digits is 19200, while the sum is 32.

The square root of 856445 is about 925.4431370970. The cubic root of 856445 is about 94.9656385425.

The spelling of 856445 in words is "eight hundred fifty-six thousand, four hundred forty-five".