1244013540 has 192 divisors, whose sum is σ = 4362301440. Its totient is φ = 257333760.

The previous prime is 1244013517. The next prime is 1244013541. The reversal of 1244013540 is 453104421.

It is a self number, because there is not a number n which added to its sum of digits gives 1244013540.

It is not an unprimeable number, because it can be changed into a prime (1244013541) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 1353201 + ... + 1354119.

It is an arithmetic number, because the mean of its divisors is an integer number (22720320).

Almost surely, 2^1244013540 is an apocalyptic number.

1244013540 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 1244013540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2181150720).

1244013540 is an abundant number, since it is smaller than the sum of its proper divisors (3118287900).

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

1244013540 is a wasteful number, since it uses less digits than its factorization.

1244013540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242 (or 1240 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1244013540 is about 35270.5761223148. The cubic root of 1244013540 is about 1075.4949341650.

Adding to 1244013540 its reverse (453104421), we get a palindrome (1697117961).

The spelling of 1244013540 in words is "one billion, two hundred forty-four million, thirteen thousand, five hundred forty".