13261040 has 80 divisors (see below), whose sum is σ = 34122816. Its totient is φ = 4761600.

The previous prime is 13261021. The next prime is 13261043. The reversal of 13261040 is 4016231.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13261043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42485 + ... + 42795.

Almost surely, 2^13261040 is an apocalyptic number.

13261040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13261040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17061408).

13261040 is an abundant number, since it is smaller than the sum of its proper divisors (20861776).

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

13261040 is a wasteful number, since it uses less digits than its factorization.

13261040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 13261040 is about 3641.5710895162. The cubic root of 13261040 is about 236.6968772737.

Adding to 13261040 its reverse (4016231), we get a palindrome (17277271).

The spelling of 13261040 in words is "thirteen million, two hundred sixty-one thousand, forty".