7821822 has 16 divisors (see below), whose sum is σ = 16183440. Its totient is φ = 2517312.

The previous prime is 7821811. The next prime is 7821823. The reversal of 7821822 is 2281287.

It is a happy number.

It is a super-2 number, since 2×7821822² = 122361798799368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7821822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7821823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22303 + ... + 22650.

It is an arithmetic number, because the mean of its divisors is an integer number (1011465).

Almost surely, 2^7821822 is an apocalyptic number.

7821822 is an abundant number, since it is smaller than the sum of its proper divisors (8361618).

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

7821822 is a wasteful number, since it uses less digits than its factorization.

7821822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44987.

The product of its digits is 3584, while the sum is 30.

The square root of 7821822 is about 2796.7520447834. The cubic root of 7821822 is about 198.5040214740.

The spelling of 7821822 in words is "seven million, eight hundred twenty-one thousand, eight hundred twenty-two".