823212 has 36 divisors (see below), whose sum is σ = 2242240. Its totient is φ = 253152.

The previous prime is 823201. The next prime is 823219. The reversal of 823212 is 212328.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (823219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 412 + ... + 1347.

2⁸²³²¹² is an apocalyptic number.

It is an amenable number.

823212 is an abundant number, since it is smaller than the sum of its proper divisors (1419028).

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

823212 is a wasteful number, since it uses less digits than its factorization.

823212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1777 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 823212 is about 907.3103107537. The cubic root of 823212 is about 93.7210684059.

It can be divided in two parts, 823 and 212, that added together give a triangular number (1035 = T₄₅).

The spelling of 823212 in words is "eight hundred twenty-three thousand, two hundred twelve".