1312231423440 has 320 divisors, whose sum is σ = 4997862973440. Its totient is φ = 278106255360.

The previous prime is 1312231423423. The next prime is 1312231423493. The reversal of 1312231423440 is 443241322131.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1312231423398 and 1312231423407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1062900 + ... + 1937580.

It is an arithmetic number, because the mean of its divisors is an integer number (15618321792).

Almost surely, 2^{1312231423440} is an apocalyptic number.

1312231423440 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 1312231423440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2498931486720).

1312231423440 is an abundant number, since it is smaller than the sum of its proper divisors (3685631550000).

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

1312231423440 is a wasteful number, since it uses less digits than its factorization.

1312231423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874770 (or 874764 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 1312231423440 its reverse (443241322131), we get a palindrome (1755472745571).

The spelling of 1312231423440 in words is "one trillion, three hundred twelve billion, two hundred thirty-one million, four hundred twenty-three thousand, four hundred forty".