13618240 has 28 divisors (see below), whose sum is σ = 32429196. Its totient is φ = 5447168.

The previous prime is 13618217. The next prime is 13618249. The reversal of 13618240 is 4281631.

It can be written as a sum of positive squares in 2 ways, for example, as 10291264 + 3326976 = 3208^2 + 1824^2 .

It is not an unprimeable number, because it can be changed into a prime (13618249) by changing a digit.

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, 20959 + ... + 21598.

Almost surely, 2^13618240 is an apocalyptic number.

13618240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13618240 is an abundant number, since it is smaller than the sum of its proper divisors (18810956).

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

13618240 is an equidigital number, since it uses as much as digits as its factorization.

13618240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42574 (or 42564 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 13618240 is about 3690.2899615071. The cubic root of 13618240 is about 238.8033021530.

Adding to 13618240 its reverse (4281631), we get a palindrome (17899871).

The spelling of 13618240 in words is "thirteen million, six hundred eighteen thousand, two hundred forty".