821886 has 32 divisors (see below), whose sum is σ = 1820448. Its totient is φ = 245760.

The previous prime is 821879. The next prime is 821897. The reversal of 821886 is 688128.

It is a Curzon number.

It is a zygodrome in base 12.

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 in 15 ways as a sum of consecutive naturals, for example, 3070 + ... + 3326.

It is an arithmetic number, because the mean of its divisors is an integer number (56889).

2⁸²¹⁸⁸⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (910224).

821886 is an abundant number, since it is smaller than the sum of its proper divisors (998562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821886 is a wasteful number, since it uses less digits than its factorization.

821886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316.

The product of its digits is 6144, while the sum is 33.

The square root of 821886 is about 906.5792850049. The cubic root of 821886 is about 93.6707205320.

The spelling of 821886 in words is "eight hundred twenty-one thousand, eight hundred eighty-six".