13660240 has 120 divisors (see below), whose sum is σ = 37417248. Its totient is φ = 4596480.

The previous prime is 13660201. The next prime is 13660249. The reversal of 13660240 is 4206631.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13660249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 317659 + ... + 317701.

Almost surely, 2^13660240 is an apocalyptic number.

13660240 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 13660240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18708624).

13660240 is an abundant number, since it is smaller than the sum of its proper divisors (23757008).

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

13660240 is a wasteful number, since it uses less digits than its factorization.

13660240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 13660240 is about 3695.9761903995. The cubic root of 13660240 is about 239.0485478778.

Adding to 13660240 its reverse (4206631), we get a palindrome (17866871).

The spelling of 13660240 in words is "thirteen million, six hundred sixty thousand, two hundred forty".