1231243120340 has 48 divisors (see below), whose sum is σ = 2701356013440. Its totient is φ = 470503313280.

The previous prime is 1231243120339. The next prime is 1231243120361. The reversal of 1231243120340 is 430213421321.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1277135 + ... + 2023254.

It is an arithmetic number, because the mean of its divisors is an integer number (56278250280).

Almost surely, 2^{1231243120340} is an apocalyptic number.

1231243120340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231243120340 is an abundant number, since it is smaller than the sum of its proper divisors (1470112893100).

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

1231243120340 is a wasteful number, since it uses less digits than its factorization.

1231243120340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301232 (or 3301230 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 1231243120340 its reverse (430213421321), we get a palindrome (1661456541661).

The spelling of 1231243120340 in words is "one trillion, two hundred thirty-one billion, two hundred forty-three million, one hundred twenty thousand, three hundred forty".