13440144 has 40 divisors (see below), whose sum is σ = 36550240. Its totient is φ = 4243968.

The previous prime is 13440121. The next prime is 13440173. The reversal of 13440144 is 44104431.

It is a self number, because there is not a number n which added to its sum of digits gives 13440144.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6457 + ... + 8280.

It is an arithmetic number, because the mean of its divisors is an integer number (913756).

Almost surely, 2^13440144 is an apocalyptic number.

It is an amenable number.

13440144 is an abundant number, since it is smaller than the sum of its proper divisors (23110096).

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

13440144 is a wasteful number, since it uses less digits than its factorization.

13440144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14767 (or 14761 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 13440144 is about 3666.0801955222. The cubic root of 13440144 is about 237.7577272392.

Adding to 13440144 its reverse (44104431), we get a palindrome (57544575).

The spelling of 13440144 in words is "thirteen million, four hundred forty thousand, one hundred forty-four".