1243013231440 has 20 divisors (see below), whose sum is σ = 2890005763284. Its totient is φ = 497205292544.

The previous prime is 1243013231423. The next prime is 1243013231461. The reversal of 1243013231440 is 441323103421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 162128633104 + 1080884598336 = 402652^2 + 1039656^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1243013231440² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1243013231399 and 1243013231408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7768832617 + ... + 7768832776.

Almost surely, 2^{1243013231440} is an apocalyptic number.

1243013231440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243013231440 is an abundant number, since it is smaller than the sum of its proper divisors (1646992531844).

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

1243013231440 is a wasteful number, since it uses less digits than its factorization.

1243013231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15537665406 (or 15537665400 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1243013231440 its reverse (441323103421), we get a palindrome (1684336334861).

The spelling of 1243013231440 in words is "one trillion, two hundred forty-three billion, thirteen million, two hundred thirty-one thousand, four hundred forty".