821912 has 32 divisors (see below), whose sum is σ = 1898400. Its totient is φ = 324864.

The previous prime is 821911. The next prime is 821939. The reversal of 821912 is 219128.

It is a plaindrome in base 12.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821911) 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, 164 + ... + 1292.

It is an arithmetic number, because the mean of its divisors is an integer number (59325).

2⁸²¹⁹¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (949200).

821912 is an abundant number, since it is smaller than the sum of its proper divisors (1076488).

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

821912 is a wasteful number, since it uses less digits than its factorization.

821912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155 (or 1151 counting only the distinct ones).

The product of its digits is 288, while the sum is 23.

The square root of 821912 is about 906.5936245088. The cubic root of 821912 is about 93.6717082655.

The spelling of 821912 in words is "eight hundred twenty-one thousand, nine hundred twelve".