1404224 has 28 divisors (see below), whose sum is σ = 2866644. Its totient is φ = 681984.

The previous prime is 1404211. The next prime is 1404229. The reversal of 1404224 is 4224041.

It is a Cunningham number, because it is equal to 1185²-1.

It can be written as a sum of positive squares in 2 ways, for example, as 1081600 + 322624 = 1040^2 + 568^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1404229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2072 + ... + 2664.

2^1404224 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 1404224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1433322).

1404224 is an abundant number, since it is smaller than the sum of its proper divisors (1462420).

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

1404224 is an equidigital number, since it uses as much as digits as its factorization.

1404224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 1404224 is about 1184.9995780590. Note that the first 3 decimals coincide. The cubic root of 1404224 is about 111.9812893914.

Adding to 1404224 its reverse (4224041), we get a palindrome (5628265).

The spelling of 1404224 in words is "one million, four hundred four thousand, two hundred twenty-four".