13506440 has 16 divisors (see below), whose sum is σ = 30389580. Its totient is φ = 5402560.

The previous prime is 13506439. The next prime is 13506481. The reversal of 13506440 is 4460531.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12292036 + 1214404 = 3506^2 + 1102^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 168791 + ... + 168870.

Almost surely, 2^13506440 is an apocalyptic number.

13506440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13506440 is an abundant number, since it is smaller than the sum of its proper divisors (16883140).

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

13506440 is a wasteful number, since it uses less digits than its factorization.

13506440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337672 (or 337668 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 13506440 is about 3675.1108826810. The cubic root of 13506440 is about 238.1480142309.

Adding to 13506440 its reverse (4460531), we get a palindrome (17966971).

The spelling of 13506440 in words is "thirteen million, five hundred six thousand, four hundred forty".