821382 has 8 divisors (see below), whose sum is σ = 1642776. Its totient is φ = 273792.

The previous prime is 821377. The next prime is 821383. The reversal of 821382 is 283128.

It is a sphenic number, since it is the product of 3 distinct primes.

821382 is an admirable number.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68443 + ... + 68454.

It is an arithmetic number, because the mean of its divisors is an integer number (205347).

2⁸²¹³⁸² is an apocalyptic number.

821382 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

821382 is a wasteful number, since it uses less digits than its factorization.

821382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136902.

The product of its digits is 768, while the sum is 24.

The square root of 821382 is about 906.3012744116. The cubic root of 821382 is about 93.6515695806.

The spelling of 821382 in words is "eight hundred twenty-one thousand, three hundred eighty-two".