1323420005440 has 56 divisors (see below), whose sum is σ = 3393808813080. Its totient is φ = 488647385088.

The previous prime is 1323420005423. The next prime is 1323420005449. The reversal of 1323420005440 is 445000243231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 133523006464 + 1189896998976 = 365408^2 + 1090824^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1323420005399 and 1323420005408.

It is not an unprimeable number, because it can be changed into a prime (1323420005449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159060745 + ... + 159069064.

It is an arithmetic number, because the mean of its divisors is an integer number (60603728805).

Almost surely, 2^{1323420005440} is an apocalyptic number.

1323420005440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323420005440 is an abundant number, since it is smaller than the sum of its proper divisors (2070388807640).

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

1323420005440 is a wasteful number, since it uses less digits than its factorization.

1323420005440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318129839 (or 318129829 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 1323420005440 its reverse (445000243231), we get a palindrome (1768420248671).

The spelling of 1323420005440 in words is "one trillion, three hundred twenty-three billion, four hundred twenty million, five thousand, four hundred forty".