1243403240000 has 140 divisors (see below), whose sum is σ = 3092105131500. Its totient is φ = 495930624000.

The previous prime is 1243403239957. The next prime is 1243403240021. The reversal of 1243403240000 is 423043421.

It can be written as a sum of positive squares in 10 ways, for example, as 1019469857344 + 223933382656 = 1009688^2 + 473216^2 .

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 13915466 + ... + 14004534.

It is an arithmetic number, because the mean of its divisors is an integer number (22086465225).

Almost surely, 2^{1243403240000} is an apocalyptic number.

1243403240000 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 1243403240000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1546052565750).

1243403240000 is an abundant number, since it is smaller than the sum of its proper divisors (1848701891500).

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

1243403240000 is an frugal number, since it uses more digits than its factorization.

1243403240000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89450 (or 89425 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 1243403240000 its reverse (423043421), we get a palindrome (1243826283421).

The spelling of 1243403240000 in words is "one trillion, two hundred forty-three billion, four hundred three million, two hundred forty thousand".