13320440 has 64 divisors (see below), whose sum is σ = 34637760. Its totient is φ = 4515840.

The previous prime is 13320431. The next prime is 13320443. The reversal of 13320440 is 4402331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13320443) 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 15 ways as a sum of consecutive naturals, for example, 31430 + ... + 31850.

It is an arithmetic number, because the mean of its divisors is an integer number (541215).

Almost surely, 2^13320440 is an apocalyptic number.

13320440 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 13320440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17318880).

13320440 is an abundant number, since it is smaller than the sum of its proper divisors (21317320).

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

13320440 is a wasteful number, since it uses less digits than its factorization.

13320440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 13320440 is about 3649.7177973098. The cubic root of 13320440 is about 237.0497619640.

Adding to 13320440 its reverse (4402331), we get a palindrome (17722771).

The spelling of 13320440 in words is "thirteen million, three hundred twenty thousand, four hundred forty".