7821233 has 6 divisors (see below), whose sum is σ = 9098226. Its totient is φ = 6703872.

The previous prime is 7821221. The next prime is 7821239. The reversal of 7821233 is 3321287.

7821233 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3952144 + 3869089 = 1988^2 + 1967^2 .

It is not a de Polignac number, because 7821233 - 2⁶ = 7821169 is a prime.

It is a super-2 number, since 2×7821233² = 122343371280578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7821239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79760 + ... + 79857.

It is an arithmetic number, because the mean of its divisors is an integer number (1516371).

Almost surely, 2^7821233 is an apocalyptic number.

It is an amenable number.

7821233 is a deficient number, since it is larger than the sum of its proper divisors (1276993).

7821233 is a wasteful number, since it uses less digits than its factorization.

7821233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159631 (or 159624 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 7821233 is about 2796.6467420824. The cubic root of 7821233 is about 198.4990387558.

The spelling of 7821233 in words is "seven million, eight hundred twenty-one thousand, two hundred thirty-three".