821894 has 8 divisors (see below), whose sum is σ = 1242648. Its totient is φ = 407680.

The previous prime is 821879. The next prime is 821897. The reversal of 821894 is 498128.

It is a happy number.

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

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 821894.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821897) by changing a digit.

821894 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, 1307 + ... + 1830.

It is an arithmetic number, because the mean of its divisors is an integer number (155331).

2⁸²¹⁸⁹⁴ is an apocalyptic number.

821894 is a deficient number, since it is larger than the sum of its proper divisors (420754).

821894 is a wasteful number, since it uses less digits than its factorization.

821894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270.

The product of its digits is 4608, while the sum is 32.

The square root of 821894 is about 906.5836971841. The cubic root of 821894 is about 93.6710244522.

The spelling of 821894 in words is "eight hundred twenty-one thousand, eight hundred ninety-four".