876821 has 8 divisors (see below), whose sum is σ = 969600. Its totient is φ = 786240.

The previous prime is 876817. The next prime is 876823. The reversal of 876821 is 128678.

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 876821 - 2² = 876817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (876823) 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, 365 + ... + 1373.

It is an arithmetic number, because the mean of its divisors is an integer number (121200).

2⁸⁷⁶⁸²¹ is an apocalyptic number.

It is an amenable number.

876821 is a deficient number, since it is larger than the sum of its proper divisors (92779).

876821 is a wasteful number, since it uses less digits than its factorization.

876821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099.

The product of its digits is 5376, while the sum is 32.

The square root of 876821 is about 936.3872062347. The cubic root of 876821 is about 95.7128645473.

The spelling of 876821 in words is "eight hundred seventy-six thousand, eight hundred twenty-one".