3221816 has 24 divisors (see below), whose sum is σ = 6544080. Its totient is φ = 1486368.

The previous prime is 3221809. The next prime is 3221819. The reversal of 3221816 is 6181223.

It is a junction number, because it is equal to n+sod(n) for n = 3221791 and 3221800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221819) 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, 161 + ... + 2543.

It is an arithmetic number, because the mean of its divisors is an integer number (272670).

Almost surely, 2^3221816 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 3221816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3272040).

3221816 is an abundant number, since it is smaller than the sum of its proper divisors (3322264).

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

3221816 is a wasteful number, since it uses less digits than its factorization.

3221816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415 (or 2398 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 3221816 is about 1794.9417817857. The cubic root of 3221816 is about 147.6953802668.

The spelling of 3221816 in words is "three million, two hundred twenty-one thousand, eight hundred sixteen".