12440240 has 40 divisors (see below), whose sum is σ = 30185568. Its totient is φ = 4759040.

The previous prime is 12440227. The next prime is 12440249. The reversal of 12440240 is 4204421.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (12440249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1541 + ... + 5220.

Almost surely, 2^12440240 is an apocalyptic number.

12440240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12440240 is an abundant number, since it is smaller than the sum of its proper divisors (17745328).

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

12440240 is a wasteful number, since it uses less digits than its factorization.

12440240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6797 (or 6791 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 12440240 is about 3527.0724404242. The cubic root of 12440240 is about 231.7090089321.

Adding to 12440240 its reverse (4204421), we get a palindrome (16644661).

The spelling of 12440240 in words is "twelve million, four hundred forty thousand, two hundred forty".