856943 has 2 divisors, whose sum is σ = 856944. Its totient is φ = 856942.

The previous prime is 856939. The next prime is 856949. The reversal of 856943 is 349658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 856943 - 2² = 856939 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428471 + 428472.

It is an arithmetic number, because the mean of its divisors is an integer number (428472).

2⁸⁵⁶⁹⁴³ is an apocalyptic number.

856943 is a deficient number, since it is larger than the sum of its proper divisors (1).

856943 is an equidigital number, since it uses as much as digits as its factorization.

856943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 856943 is about 925.7121582868. The cubic root of 856943 is about 94.9840416408.

The spelling of 856943 in words is "eight hundred fifty-six thousand, nine hundred forty-three".