13440340 has 24 divisors (see below), whose sum is σ = 29199240. Its totient is φ = 5190528.

The previous prime is 13440307. The next prime is 13440341. The reversal of 13440340 is 4304431.

It can be written as a sum of positive squares in 4 ways, for example, as 784 + 13439556 = 28^2 + 3666^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440341) 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, 11007 + ... + 12166.

It is an arithmetic number, because the mean of its divisors is an integer number (1216635).

Almost surely, 2^13440340 is an apocalyptic number.

13440340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13440340 is an abundant number, since it is smaller than the sum of its proper divisors (15758900).

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

13440340 is a wasteful number, since it uses less digits than its factorization.

13440340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23211 (or 23209 counting only the distinct ones).

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

The square root of 13440340 is about 3666.1069269731. The cubic root of 13440340 is about 237.7588829879.

Adding to 13440340 its reverse (4304431), we get a palindrome (17744771).

The spelling of 13440340 in words is "thirteen million, four hundred forty thousand, three hundred forty".