1444263540 has 96 divisors (see below), whose sum is σ = 4201424640. Its totient is φ = 370406400.

The previous prime is 1444263533. The next prime is 1444263547. The reversal of 1444263540 is 453624441.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1444263533) and next prime (1444263547).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1444263547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170526 + ... + 178794.

It is an arithmetic number, because the mean of its divisors is an integer number (43764840).

Almost surely, 2^1444263540 is an apocalyptic number.

1444263540 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 1444263540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2100712320).

1444263540 is an abundant number, since it is smaller than the sum of its proper divisors (2757161100).

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

1444263540 is a wasteful number, since it uses less digits than its factorization.

1444263540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8393 (or 8391 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 33.

The square root of 1444263540 is about 38003.4674733767. The cubic root of 1444263540 is about 1130.3566211969.

Adding to 1444263540 its reverse (453624441), we get a palindrome (1897887981).

The spelling of 1444263540 in words is "one billion, four hundred forty-four million, two hundred sixty-three thousand, five hundred forty".