856963 has 4 divisors (see below), whose sum is σ = 865080. Its totient is φ = 848848.

The previous prime is 856949. The next prime is 856969. The reversal of 856963 is 369658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 369658 = 2 ⋅184829.

It is a cyclic number.

It is not a de Polignac number, because 856963 - 2¹⁷ = 725891 is a prime.

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

It is a Duffinian number.

856963 is a modest number, since divided by 963 gives 856 as remainder.

It is not an unprimeable number, because it can be changed into a prime (856969) 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, 3898 + ... + 4111.

It is an arithmetic number, because the mean of its divisors is an integer number (216270).

2⁸⁵⁶⁹⁶³ is an apocalyptic number.

856963 is a deficient number, since it is larger than the sum of its proper divisors (8117).

856963 is a wasteful number, since it uses less digits than its factorization.

856963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8116.

The product of its digits is 38880, while the sum is 37.

The square root of 856963 is about 925.7229607177. The cubic root of 856963 is about 94.9847805721.

The spelling of 856963 in words is "eight hundred fifty-six thousand, nine hundred sixty-three".