1644424 has 8 divisors (see below), whose sum is σ = 3083310. Its totient is φ = 822208.

The previous prime is 1644421. The next prime is 1644437. The reversal of 1644424 is 4244461.

It can be written as a sum of positive squares in only one way, i.e., 1643524 + 900 = 1282^2 + 30^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1644421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102769 + ... + 102784.

2^1644424 is an apocalyptic number.

It is an amenable number.

1644424 is a deficient number, since it is larger than the sum of its proper divisors (1438886).

1644424 is a wasteful number, since it uses less digits than its factorization.

1644424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205559 (or 205555 counting only the distinct ones).

The product of its digits is 3072, while the sum is 25.

The square root of 1644424 is about 1282.3509659996. The cubic root of 1644424 is about 118.0333143512.

Adding to 1644424 its reverse (4244461), we get a palindrome (5888885).

The spelling of 1644424 in words is "one million, six hundred forty-four thousand, four hundred twenty-four".