1440344020 has 96 divisors (see below), whose sum is σ = 3259670400. Its totient is φ = 532998144.

The previous prime is 1440343997. The next prime is 1440344033. The reversal of 1440344020 is 204430441.

It is a junction number, because it is equal to n+sod(n) for n = 1440343982 and 1440344000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3800191 + ... + 3800569.

It is an arithmetic number, because the mean of its divisors is an integer number (33954900).

Almost surely, 2^1440344020 is an apocalyptic number.

1440344020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1440344020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1629835200).

1440344020 is an abundant number, since it is smaller than the sum of its proper divisors (1819326380).

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

1440344020 is a wasteful number, since it uses less digits than its factorization.

1440344020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 1440344020 is about 37951.8645128273. The cubic root of 1440344020 is about 1129.3331539455. Note that the first 3 decimals are identical.

Adding to 1440344020 its reverse (204430441), we get a palindrome (1644774461).

The spelling of 1440344020 in words is "one billion, four hundred forty million, three hundred forty-four thousand, twenty".