1440444500 has 144 divisors (see below), whose sum is σ = 3581519760. Its totient is φ = 505120000.

The previous prime is 1440444491. The next prime is 1440444559. The reversal of 1440444500 is 54440441.

It can be written as a sum of positive squares in 8 ways, for example, as 613651984 + 826792516 = 24772^2 + 28754^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1440444500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1754090 + ... + 1754910.

It is an arithmetic number, because the mean of its divisors is an integer number (24871665).

Almost surely, 2^1440444500 is an apocalyptic number.

1440444500 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 1440444500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1790759880).

1440444500 is an abundant number, since it is smaller than the sum of its proper divisors (2141075260).

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

1440444500 is a wasteful number, since it uses less digits than its factorization.

1440444500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 1440444500 is about 37953.1882718699. The cubic root of 1440444500 is about 1129.3594145136.

Adding to 1440444500 its reverse (54440441), we get a palindrome (1494884941).

The spelling of 1440444500 in words is "one billion, four hundred forty million, four hundred forty-four thousand, five hundred".