1243120231440 has 60 divisors (see below), whose sum is σ = 4174812113004. Its totient is φ = 331498728192.

The previous prime is 1243120231421. The next prime is 1243120231477. The reversal of 1243120231440 is 441320213421.

1243120231440 is a `hidden beast` number, since 12 + 4 + 3 + 1 + 202 + 3 + 1 + 440 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 686061010944 + 557059220496 = 828288^2 + 746364^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 863277219 + ... + 863278658.

Almost surely, 2^{1243120231440} is an apocalyptic number.

1243120231440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243120231440 is an abundant number, since it is smaller than the sum of its proper divisors (2931691881564).

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

1243120231440 is a wasteful number, since it uses less digits than its factorization.

1243120231440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726555896 (or 1726555887 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 1243120231440 its reverse (441320213421), we get a palindrome (1684440444861).

The spelling of 1243120231440 in words is "one trillion, two hundred forty-three billion, one hundred twenty million, two hundred thirty-one thousand, four hundred forty".