13261440 has 64 divisors (see below), whose sum is σ = 42276960. Its totient is φ = 3535872.

The previous prime is 13261433. The next prime is 13261441. The reversal of 13261440 is 4416231.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (13261441) 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, 1534 + ... + 5373.

Almost surely, 2^13261440 is an apocalyptic number.

13261440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13261440 is an abundant number, since it is smaller than the sum of its proper divisors (29015520).

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

13261440 is an equidigital number, since it uses as much as digits as its factorization.

13261440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6929 (or 6917 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 13261440 is about 3641.6260104519. The cubic root of 13261440 is about 236.6992571222.

Adding to 13261440 its reverse (4416231), we get a palindrome (17677671).

The spelling of 13261440 in words is "thirteen million, two hundred sixty-one thousand, four hundred forty".