3221556 has 48 divisors (see below), whose sum is σ = 8213184. Its totient is φ = 976896.

The previous prime is 3221549. The next prime is 3221557. The reversal of 3221556 is 6551223.

It is a super-2 number, since 2×3221556² = 20756846122272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16596 + ... + 16788.

It is an arithmetic number, because the mean of its divisors is an integer number (171108).

Almost surely, 2^3221556 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 3221556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4106592).

3221556 is an abundant number, since it is smaller than the sum of its proper divisors (4991628).

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

3221556 is a wasteful number, since it uses less digits than its factorization.

3221556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 318 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 3221556 is about 1794.8693545771. The cubic root of 3221556 is about 147.6914071626.

Adding to 3221556 its reverse (6551223), we get a palindrome (9772779).

The spelling of 3221556 in words is "three million, two hundred twenty-one thousand, five hundred fifty-six".