821676 has 12 divisors (see below), whose sum is σ = 1917272. Its totient is φ = 273888.

The previous prime is 821663. The next prime is 821677. The reversal of 821676 is 676128.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (821677) by changing a digit.

821676 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34225 + ... + 34248.

2⁸²¹⁶⁷⁶ is an apocalyptic number.

It is an amenable number.

821676 is an abundant number, since it is smaller than the sum of its proper divisors (1095596).

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

821676 is a wasteful number, since it uses less digits than its factorization.

821676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68480 (or 68478 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 821676 is about 906.4634576198. The cubic root of 821676 is about 93.6627419206.

The spelling of 821676 in words is "eight hundred twenty-one thousand, six hundred seventy-six".