13444640 has 48 divisors (see below), whose sum is σ = 34655040. Its totient is φ = 4888320.

The previous prime is 13444633. The next prime is 13444643. The reversal of 13444640 is 4644431.

It is not an unprimeable number, because it can be changed into a prime (13444643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2060 + ... + 5579.

It is an arithmetic number, because the mean of its divisors is an integer number (721980).

Almost surely, 2^13444640 is an apocalyptic number.

13444640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13444640 is an abundant number, since it is smaller than the sum of its proper divisors (21210400).

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

13444640 is a wasteful number, since it uses less digits than its factorization.

13444640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7665 (or 7657 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 13444640 is about 3666.6933332364. The cubic root of 13444640 is about 237.7842358730.

The spelling of 13444640 in words is "thirteen million, four hundred forty-four thousand, six hundred forty".