821086 has 16 divisors (see below), whose sum is σ = 1419264. Its totient is φ = 348984.

The previous prime is 821081. The next prime is 821089. The reversal of 821086 is 680128.

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 821086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821081) 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, 2991 + ... + 3253.

It is an arithmetic number, because the mean of its divisors is an integer number (88704).

2⁸²¹⁰⁸⁶ is an apocalyptic number.

821086 is a deficient number, since it is larger than the sum of its proper divisors (598178).

821086 is a wasteful number, since it uses less digits than its factorization.

821086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 821086 is about 906.1379585913. The cubic root of 821086 is about 93.6403185446.

The spelling of 821086 in words is "eight hundred twenty-one thousand, eighty-six".