1243040420440 has 384 divisors, whose sum is σ = 3545452892160. Its totient is φ = 383874895872.

The previous prime is 1243040420423. The next prime is 1243040420459. The reversal of 1243040420440 is 440240403421.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1243040420399 and 1243040420408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1016385669 + ... + 1016386891.

It is an arithmetic number, because the mean of its divisors is an integer number (9232950240).

Almost surely, 2^{1243040420440} is an apocalyptic number.

1243040420440 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 1243040420440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1772726446080).

1243040420440 is an abundant number, since it is smaller than the sum of its proper divisors (2302412471720).

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

1243040420440 is a wasteful number, since it uses less digits than its factorization.

1243040420440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771 (or 1754 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 1243040420440 its reverse (440240403421), we get a palindrome (1683280823861).

The spelling of 1243040420440 in words is "one trillion, two hundred forty-three billion, forty million, four hundred twenty thousand, four hundred forty".