13509240 has 32 divisors (see below), whose sum is σ = 40528080. Its totient is φ = 3602432.

The previous prime is 13509233. The next prime is 13509253. The reversal of 13509240 is 4290531.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 13509240.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 56169 + ... + 56408.

Almost surely, 2^13509240 is an apocalyptic number.

13509240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13509240 is an abundant number, since it is smaller than the sum of its proper divisors (27018840).

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

13509240 is a wasteful number, since it uses less digits than its factorization.

13509240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112591 (or 112587 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 13509240 is about 3675.4918038271. The cubic root of 13509240 is about 238.1644697975.

Adding to 13509240 its reverse (4290531), we get a palindrome (17799771).

The spelling of 13509240 in words is "thirteen million, five hundred nine thousand, two hundred forty".