12440140 has 24 divisors (see below), whose sum is σ = 26831952. Its totient is φ = 4841280.

The previous prime is 12440137. The next prime is 12440143. The reversal of 12440140 is 4104421.

It is an interprime number because it is at equal distance from previous prime (12440137) and next prime (12440143).

It is not an unprimeable number, because it can be changed into a prime (12440143) 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, 7666 + ... + 9145.

It is an arithmetic number, because the mean of its divisors is an integer number (1117998).

Almost surely, 2^12440140 is an apocalyptic number.

12440140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12440140 is an abundant number, since it is smaller than the sum of its proper divisors (14391812).

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

12440140 is a wasteful number, since it uses less digits than its factorization.

12440140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16857 (or 16855 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 12440140 is about 3527.0582643330. The cubic root of 12440140 is about 231.7083880715.

Adding to 12440140 its reverse (4104421), we get a palindrome (16544561).

The spelling of 12440140 in words is "twelve million, four hundred forty thousand, one hundred forty".