13081440 has 48 divisors (see below), whose sum is σ = 41208048. Its totient is φ = 3488256.

The previous prime is 13081433. The next prime is 13081447. The reversal of 13081440 is 4418031.

13081440 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13081433) and next prime (13081447).

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×13081440² = 342248144947200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13081447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13147 + ... + 14106.

It is an arithmetic number, because the mean of its divisors is an integer number (858501).

Almost surely, 2^13081440 is an apocalyptic number.

13081440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13081440 is an abundant number, since it is smaller than the sum of its proper divisors (28126608).

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

13081440 is a wasteful number, since it uses less digits than its factorization.

13081440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27271 (or 27263 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 13081440 is about 3616.8273389809. The cubic root of 13081440 is about 235.6234539179.

Adding to 13081440 its reverse (4418031), we get a palindrome (17499471).

The spelling of 13081440 in words is "thirteen million, eighty-one thousand, four hundred forty".