13043440 has 40 divisors (see below), whose sum is σ = 30980160. Its totient is φ = 5104896.

The previous prime is 13043431. The next prime is 13043441. The reversal of 13043440 is 4434031.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13043441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2026 + ... + 5494.

It is an arithmetic number, because the mean of its divisors is an integer number (774504).

Almost surely, 2^13043440 is an apocalyptic number.

13043440 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 13043440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15490080).

13043440 is an abundant number, since it is smaller than the sum of its proper divisors (17936720).

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

13043440 is a wasteful number, since it uses less digits than its factorization.

13043440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529 (or 3523 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 13043440 is about 3611.5702955917. The cubic root of 13043440 is about 235.3950801032.

Adding to 13043440 its reverse (4434031), we get a palindrome (17477471).

The spelling of 13043440 in words is "thirteen million, forty-three thousand, four hundred forty".