13311440 has 20 divisors (see below), whose sum is σ = 30949284. Its totient is φ = 5324544.

The previous prime is 13311437. The next prime is 13311443. The reversal of 13311440 is 4411331.

13311440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (13311437) and next prime (13311443).

It can be written as a sum of positive squares in 2 ways, for example, as 2917264 + 10394176 = 1708^2 + 3224^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13311443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83117 + ... + 83276.

Almost surely, 2^13311440 is an apocalyptic number.

13311440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13311440 is an abundant number, since it is smaller than the sum of its proper divisors (17637844).

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

13311440 is a wasteful number, since it uses less digits than its factorization.

13311440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166406 (or 166400 counting only the distinct ones).

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

The square root of 13311440 is about 3648.4846169334. The cubic root of 13311440 is about 236.9963621131.

Adding to 13311440 its reverse (4411331), we get a palindrome (17722771).

The spelling of 13311440 in words is "thirteen million, three hundred eleven thousand, four hundred forty".