12440520 has 64 divisors (see below), whose sum is σ = 41472000. Its totient is φ = 3317184.

The previous prime is 12440513. The next prime is 12440521. The reversal of 12440520 is 2504421.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12440493 and 12440502.

It is not an unprimeable number, because it can be changed into a prime (12440521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4680 + ... + 6839.

It is an arithmetic number, because the mean of its divisors is an integer number (648000).

Almost surely, 2^12440520 is an apocalyptic number.

12440520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12440520 is an abundant number, since it is smaller than the sum of its proper divisors (29031480).

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

12440520 is a wasteful number, since it uses less digits than its factorization.

12440520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11539 (or 11529 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 12440520 is about 3527.1121331764. The cubic root of 12440520 is about 231.7107473239.

Adding to 12440520 its reverse (2504421), we get a palindrome (14944941).

The spelling of 12440520 in words is "twelve million, four hundred forty thousand, five hundred twenty".