3821216 has 36 divisors (see below), whose sum is σ = 8754858. Its totient is φ = 1636992.

The previous prime is 3821203. The next prime is 3821219. The reversal of 3821216 is 6121283.

It can be written as a sum of positive squares in only one way, i.e., 2371600 + 1449616 = 1540^2 + 1204^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3821191 and 3821200.

It is not an unprimeable number, because it can be changed into a prime (3821219) 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, 350 + ... + 2786.

Almost surely, 2^3821216 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 3821216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4377429).

3821216 is an abundant number, since it is smaller than the sum of its proper divisors (4933642).

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

3821216 is a wasteful number, since it uses less digits than its factorization.

3821216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461 (or 2446 counting only the distinct ones).

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

The square root of 3821216 is about 1954.7930836792. The cubic root of 3821216 is about 156.3389518042.

Adding to 3821216 its reverse (6121283), we get a palindrome (9942499).

The spelling of 3821216 in words is "three million, eight hundred twenty-one thousand, two hundred sixteen".