3221616 has 40 divisors (see below), whose sum is σ = 8530704. Its totient is φ = 1047040.

The previous prime is 3221599. The next prime is 3221629. The reversal of 3221616 is 6161223.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 3221592 and 3221601.

It is a congruent number.

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, 1150 + ... + 2786.

Almost surely, 2^3221616 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 3221616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4265352).

3221616 is an abundant number, since it is smaller than the sum of its proper divisors (5309088).

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

3221616 is a wasteful number, since it uses less digits than its factorization.

3221616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689 (or 1683 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 3221616 is about 1794.8860688077. The cubic root of 3221616 is about 147.6923240518.

Adding to 3221616 its reverse (6161223), we get a palindrome (9382839).

The spelling of 3221616 in words is "three million, two hundred twenty-one thousand, six hundred sixteen".