1440144240 has 80 divisors (see below), whose sum is σ = 4473597600. Its totient is φ = 383251456.

The previous prime is 1440144203. The next prime is 1440144247. The reversal of 1440144240 is 424410441.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1440144240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440144247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116266 + ... + 128054.

It is an arithmetic number, because the mean of its divisors is an integer number (55919970).

Almost surely, 2^1440144240 is an apocalyptic number.

1440144240 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 1440144240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2236798800).

1440144240 is an abundant number, since it is smaller than the sum of its proper divisors (3033453360).

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

1440144240 is a wasteful number, since it uses less digits than its factorization.

1440144240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12314 (or 12308 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 1440144240 is about 37949.2324033043. The cubic root of 1440144240 is about 1129.2809375753.

Adding to 1440144240 its reverse (424410441), we get a palindrome (1864554681).

The spelling of 1440144240 in words is "one billion, four hundred forty million, one hundred forty-four thousand, two hundred forty".