1644216 has 32 divisors (see below), whose sum is σ = 4698240. Its totient is φ = 469728.

The previous prime is 1644199. The next prime is 1644217. The reversal of 1644216 is 6124461.

It is a super-3 number, since 3×1644216³ = 13335148761136409088, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 (1644217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4726 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (146820).

2^1644216 is an apocalyptic number.

It is an amenable number.

1644216 is an abundant number, since it is smaller than the sum of its proper divisors (3054024).

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

1644216 is a wasteful number, since it uses less digits than its factorization.

1644216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9803 (or 9799 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 1644216 is about 1282.2698623925. The cubic root of 1644216 is about 118.0283375397.

Adding to 1644216 its reverse (6124461), we get a palindrome (7768677).

The spelling of 1644216 in words is "one million, six hundred forty-four thousand, two hundred sixteen".