821873 has 8 divisors (see below), whose sum is σ = 892416. Its totient is φ = 752400.

The previous prime is 821869. The next prime is 821879. The reversal of 821873 is 378128.

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

It is a cyclic number.

It is not a de Polignac number, because 821873 - 2² = 821869 is a prime.

It is a Duffinian number.

It is a zygodrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (821879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2318 + ... + 2648.

It is an arithmetic number, because the mean of its divisors is an integer number (111552).

2⁸²¹⁸⁷³ is an apocalyptic number.

It is an amenable number.

821873 is a deficient number, since it is larger than the sum of its proper divisors (70543).

821873 is a wasteful number, since it uses less digits than its factorization.

821873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535.

The product of its digits is 2688, while the sum is 29.

The square root of 821873 is about 906.5721151679. The cubic root of 821873 is about 93.6702266574.

The spelling of 821873 in words is "eight hundred twenty-one thousand, eight hundred seventy-three".