856822 has 4 divisors (see below), whose sum is σ = 1285236. Its totient is φ = 428410.

The previous prime is 856813. The next prime is 856831. The reversal of 856822 is 228658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 228658 = 2 ⋅114329.

It is an interprime number because it is at equal distance from previous prime (856813) and next prime (856831).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 214204 + ... + 214207.

It is an arithmetic number, because the mean of its divisors is an integer number (321309).

2⁸⁵⁶⁸²² is an apocalyptic number.

856822 is a deficient number, since it is larger than the sum of its proper divisors (428414).

856822 is a wasteful number, since it uses less digits than its factorization.

856822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428413.

The product of its digits is 7680, while the sum is 31.

The square root of 856822 is about 925.6468008911. The cubic root of 856822 is about 94.9795708611.

The spelling of 856822 in words is "eight hundred fifty-six thousand, eight hundred twenty-two".