1440224420 has 12 divisors (see below), whose sum is σ = 3024471324. Its totient is φ = 576089760.

The previous prime is 1440224407. The next prime is 1440224447. The reversal of 1440224420 is 244220441.

It can be written as a sum of positive squares in 2 ways, for example, as 750321664 + 689902756 = 27392^2 + 26266^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36005591 + ... + 36005630.

It is an arithmetic number, because the mean of its divisors is an integer number (252039277).

Almost surely, 2^1440224420 is an apocalyptic number.

1440224420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1440224420 is an abundant number, since it is smaller than the sum of its proper divisors (1584246904).

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

1440224420 is a wasteful number, since it uses less digits than its factorization.

1440224420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72011230 (or 72011228 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 1440224420 is about 37950.2887999551. The cubic root of 1440224420 is about 1129.3018947504.

Adding to 1440224420 its reverse (244220441), we get a palindrome (1684444861).

The spelling of 1440224420 in words is "one billion, four hundred forty million, two hundred twenty-four thousand, four hundred twenty".