5221440 has 252 divisors, whose sum is σ = 21456396. Its totient is φ = 1161216.

The previous prime is 5221399. The next prime is 5221451. The reversal of 5221440 is 441225.

5221440 is a `hidden beast` number, since 5 + 221 + 440 = 666.

5221440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3415104 + 1806336 = 1848^2 + 1344^2 .

It is a tau number, because it is divible by the number of its divisors (252).

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

It is a zygodrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 141102 + ... + 141138.

Almost surely, 2^5221440 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 5221440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10728198).

5221440 is an abundant number, since it is smaller than the sum of its proper divisors (16234956).

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

5221440 is a wasteful number, since it uses less digits than its factorization.

5221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 54 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 5221440 is about 2285.0470454676. The cubic root of 5221440 is about 173.4855992720.

Adding to 5221440 its reverse (441225), we get a palindrome (5662665).

It can be divided in two parts, 5 and 221440, that added together give a triangular number (221445 = T₆₆₅).

The spelling of 5221440 in words is "five million, two hundred twenty-one thousand, four hundred forty".