13440440 has 32 divisors (see below), whose sum is σ = 32568480. Its totient is φ = 4962432.

The previous prime is 13440437. The next prime is 13440461. The reversal of 13440440 is 4404431.

13440440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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, 12404 + ... + 13443.

It is an arithmetic number, because the mean of its divisors is an integer number (1017765).

Almost surely, 2^13440440 is an apocalyptic number.

13440440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13440440 is an abundant number, since it is smaller than the sum of its proper divisors (19128040).

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

13440440 is a wasteful number, since it uses less digits than its factorization.

13440440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25871 (or 25867 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 13440440 is about 3666.1205653933. The cubic root of 13440440 is about 237.7594726513.

Adding to 13440440 its reverse (4404431), we get a palindrome (17844871).

The spelling of 13440440 in words is "thirteen million, four hundred forty thousand, four hundred forty".