1224216 has 72 divisors (see below), whose sum is σ = 3868020. Its totient is φ = 348768.

The previous prime is 1224203. The next prime is 1224217. The reversal of 1224216 is 6124221.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 (1224217) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3355 + ... + 3701.

2^1224216 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 1224216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1934010).

1224216 is an abundant number, since it is smaller than the sum of its proper divisors (2643804).

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

1224216 is a wasteful number, since it uses less digits than its factorization.

1224216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 359 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1224216 is about 1106.4429492748. The cubic root of 1224216 is about 106.9759167856.

Adding to 1224216 its reverse (6124221), we get a palindrome (7348437).

The spelling of 1224216 in words is "one million, two hundred twenty-four thousand, two hundred sixteen".