13144640 has 28 divisors (see below), whose sum is σ = 31301436. Its totient is φ = 5257728.

The previous prime is 13144639. The next prime is 13144673. The reversal of 13144640 is 4644131.

It can be written as a sum of positive squares in 2 ways, for example, as 9048064 + 4096576 = 3008^2 + 2024^2 .

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20219 + ... + 20858.

Almost surely, 2^13144640 is an apocalyptic number.

13144640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13144640 is an abundant number, since it is smaller than the sum of its proper divisors (18156796).

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

13144640 is an equidigital number, since it uses as much as digits as its factorization.

13144640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41094 (or 41084 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 13144640 is about 3625.5537508083. The cubic root of 13144640 is about 236.0022981678.

Adding to 13144640 its reverse (4644131), we get a palindrome (17788771).

The spelling of 13144640 in words is "thirteen million, one hundred forty-four thousand, six hundred forty".