13205240 has 16 divisors (see below), whose sum is σ = 29711880. Its totient is φ = 5282080.

The previous prime is 13205207. The next prime is 13205249. The reversal of 13205240 is 4250231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13205249) 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, 165026 + ... + 165105.

Almost surely, 2^13205240 is an apocalyptic number.

13205240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13205240 is an abundant number, since it is smaller than the sum of its proper divisors (16506640).

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

13205240 is a wasteful number, since it uses less digits than its factorization.

13205240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330142 (or 330138 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 13205240 is about 3633.9014846305. The cubic root of 13205240 is about 236.3644183227.

Adding to 13205240 its reverse (4250231), we get a palindrome (17455471).

The spelling of 13205240 in words is "thirteen million, two hundred five thousand, two hundred forty".