13644340 has 48 divisors (see below), whose sum is σ = 30159360. Its totient is φ = 5178240.

The previous prime is 13644331. The next prime is 13644347. The reversal of 13644340 is 4344631.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13644347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36394 + ... + 36766.

It is an arithmetic number, because the mean of its divisors is an integer number (628320).

Almost surely, 2^13644340 is an apocalyptic number.

13644340 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 13644340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15079680).

13644340 is an abundant number, since it is smaller than the sum of its proper divisors (16515020).

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

13644340 is a wasteful number, since it uses less digits than its factorization.

13644340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 13644340 is about 3693.8245762353. The cubic root of 13644340 is about 238.9557640625.

Adding to 13644340 its reverse (4344631), we get a palindrome (17988971).

The spelling of 13644340 in words is "thirteen million, six hundred forty-four thousand, three hundred forty".