1243243455040 has 112 divisors (see below), whose sum is σ = 3027232189872. Its totient is φ = 486151151616.

The previous prime is 1243243455019. The next prime is 1243243455061. The reversal of 1243243455040 is 405543423421.

It is an interprime number because it is at equal distance from previous prime (1243243455019) and next prime (1243243455061).

It can be written as a sum of positive squares in 8 ways, for example, as 57461842944 + 1185781612096 = 239712^2 + 1088936^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4565602 + ... + 4830238.

Almost surely, 2^{1243243455040} is an apocalyptic number.

1243243455040 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 1243243455040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1513616094936).

1243243455040 is an abundant number, since it is smaller than the sum of its proper divisors (1783988734832).

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

1243243455040 is a wasteful number, since it uses less digits than its factorization.

1243243455040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264984 (or 264974 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 37.

Adding to 1243243455040 its reverse (405543423421), we get a palindrome (1648786878461).

The spelling of 1243243455040 in words is "one trillion, two hundred forty-three billion, two hundred forty-three million, four hundred fifty-five thousand, forty".