821994 has 8 divisors (see below), whose sum is σ = 1644000. Its totient is φ = 273996.

The previous prime is 821993. The next prime is 821999. The reversal of 821994 is 499128.

821994 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.

821994 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (821993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68494 + ... + 68505.

It is an arithmetic number, because the mean of its divisors is an integer number (205500).

2⁸²¹⁹⁹⁴ is an apocalyptic number.

821994 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.

821994 is a wasteful number, since it uses less digits than its factorization.

821994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137004.

The product of its digits is 5184, while the sum is 33.

The square root of 821994 is about 906.6388476124. The cubic root of 821994 is about 93.6748232886.

The spelling of 821994 in words is "eight hundred twenty-one thousand, nine hundred ninety-four".