13243131440 has 80 divisors (see below), whose sum is σ = 38387900160. Its totient is φ = 4127727360.

The previous prime is 13243131439. The next prime is 13243131449. The reversal of 13243131440 is 4413134231.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (13243131449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1068770 + ... + 1081089.

It is an arithmetic number, because the mean of its divisors is an integer number (479848752).

Almost surely, 2^13243131440 is an apocalyptic number.

13243131440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13243131440 is an abundant number, since it is smaller than the sum of its proper divisors (25144768720).

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

13243131440 is a wasteful number, since it uses less digits than its factorization.

13243131440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149890 (or 2149884 counting only the distinct ones).

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

Adding to 13243131440 its reverse (4413134231), we get a palindrome (17656265671).

The spelling of 13243131440 in words is "thirteen billion, two hundred forty-three million, one hundred thirty-one thousand, four hundred forty".