821612 has 24 divisors (see below), whose sum is σ = 1596672. Its totient is φ = 366800.

The previous prime is 821603. The next prime is 821641. The reversal of 821612 is 216128.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2993 + ... + 3255.

It is an arithmetic number, because the mean of its divisors is an integer number (66528).

2⁸²¹⁶¹² is an apocalyptic number.

It is an amenable number.

821612 is a deficient number, since it is larger than the sum of its proper divisors (775060).

821612 is a wasteful number, since it uses less digits than its factorization.

821612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 347 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 821612 is about 906.4281549025. The cubic root of 821612 is about 93.6603100735.

It can be divided in two parts, 8216 and 12, that added together give a palindrome (8228).

The spelling of 821612 in words is "eight hundred twenty-one thousand, six hundred twelve".