1323140155440 has 80 divisors (see below), whose sum is σ = 4105849301088. Its totient is φ = 352483411968.

The previous prime is 1323140155439. The next prime is 1323140155453. The reversal of 1323140155440 is 445510413231.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2525557 + ... + 3004116.

Almost surely, 2^{1323140155440} is an apocalyptic number.

1323140155440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323140155440 is an abundant number, since it is smaller than the sum of its proper divisors (2782709145648).

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

1323140155440 is a wasteful number, since it uses less digits than its factorization.

1323140155440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530686 (or 5530680 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 1323140155440 its reverse (445510413231), we get a palindrome (1768650568671).

The spelling of 1323140155440 in words is "one trillion, three hundred twenty-three billion, one hundred forty million, one hundred fifty-five thousand, four hundred forty".