1231423355540 has 24 divisors (see below), whose sum is σ = 2955416053632. Its totient is φ = 422202293280.

The previous prime is 1231423355521. The next prime is 1231423355563. The reversal of 1231423355540 is 455533241321.

It is a junction number, because it is equal to n+sod(n) for n = 1231423355494 and 1231423355503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4397940416 + ... + 4397940695.

It is an arithmetic number, because the mean of its divisors is an integer number (123142335568).

Almost surely, 2^{1231423355540} is an apocalyptic number.

1231423355540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231423355540 is an abundant number, since it is smaller than the sum of its proper divisors (1723992698092).

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

1231423355540 is a wasteful number, since it uses less digits than its factorization.

1231423355540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8795881127 (or 8795881125 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 38.

Adding to 1231423355540 its reverse (455533241321), we get a palindrome (1686956596861).

The spelling of 1231423355540 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-three million, three hundred fifty-five thousand, five hundred forty".