13504440 has 64 divisors (see below), whose sum is σ = 42652800. Its totient is φ = 3411072.

The previous prime is 13504429. The next prime is 13504471. The reversal of 13504440 is 4440531.

It is a congruent number.

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, 682 + ... + 5241.

It is an arithmetic number, because the mean of its divisors is an integer number (666450).

Almost surely, 2^13504440 is an apocalyptic number.

13504440 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 13504440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21326400).

13504440 is an abundant number, since it is smaller than the sum of its proper divisors (29148360).

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

13504440 is a wasteful number, since it uses less digits than its factorization.

13504440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5956 (or 5952 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 13504440 is about 3674.8387719735. The cubic root of 13504440 is about 238.1362588624.

Adding to 13504440 its reverse (4440531), we get a palindrome (17944971).

The spelling of 13504440 in words is "thirteen million, five hundred four thousand, four hundred forty".