13240455440 has 80 divisors (see below), whose sum is σ = 32621304960. Its totient is φ = 4980602880.

The previous prime is 13240455421. The next prime is 13240455497. The reversal of 13240455440 is 4455404231.

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

It is a junction number, because it is equal to n+sod(n) for n = 13240455397 and 13240455406.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2078981 + ... + 2085339.

It is an arithmetic number, because the mean of its divisors is an integer number (407766312).

Almost surely, 2^13240455440 is an apocalyptic number.

13240455440 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 13240455440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16310652480).

13240455440 is an abundant number, since it is smaller than the sum of its proper divisors (19380849520).

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

13240455440 is a wasteful number, since it uses less digits than its factorization.

13240455440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7920 (or 7914 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 13240455440 its reverse (4455404231), we get a palindrome (17695859671).

The spelling of 13240455440 in words is "thirteen billion, two hundred forty million, four hundred fifty-five thousand, four hundred forty".