3216444 has 72 divisors (see below), whose sum is σ = 9518208. Its totient is φ = 821280.

The previous prime is 3216431. The next prime is 3216449. The reversal of 3216444 is 4446123.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3216449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54487 + ... + 54545.

Almost surely, 2^3216444 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 3216444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4759104).

3216444 is an abundant number, since it is smaller than the sum of its proper divisors (6301764).

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

3216444 is a wasteful number, since it uses less digits than its factorization.

3216444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 82 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

The square root of 3216444 is about 1793.4447301213. Note that the first 3 decimals coincide. The cubic root of 3216444 is about 147.6132463637.

The spelling of 3216444 in words is "three million, two hundred sixteen thousand, four hundred forty-four".