821946 has 8 divisors (see below), whose sum is σ = 1643904. Its totient is φ = 273980.

The previous prime is 821941. The next prime is 821971. The reversal of 821946 is 649128.

821946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

821946 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (821941) by changing a digit.

821946 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, 68490 + ... + 68501.

It is an arithmetic number, because the mean of its divisors is an integer number (205488).

2⁸²¹⁹⁴⁶ is an apocalyptic number.

821946 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.

821946 is a wasteful number, since it uses less digits than its factorization.

821946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136996.

The product of its digits is 3456, while the sum is 30.

The square root of 821946 is about 906.6123758255. The cubic root of 821946 is about 93.6729998856.

The spelling of 821946 in words is "eight hundred twenty-one thousand, nine hundred forty-six".