12445540 has 12 divisors (see below), whose sum is σ = 26135676. Its totient is φ = 4978208.

The previous prime is 12445529. The next prime is 12445541. The reversal of 12445540 is 4554421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5560164 + 6885376 = 2358^2 + 2624^2 .

It is not an unprimeable number, because it can be changed into a prime (12445541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311119 + ... + 311158.

It is an arithmetic number, because the mean of its divisors is an integer number (2177973).

Almost surely, 2^12445540 is an apocalyptic number.

12445540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12445540 is an abundant number, since it is smaller than the sum of its proper divisors (13690136).

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

12445540 is a wasteful number, since it uses less digits than its factorization.

12445540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622286 (or 622284 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 12445540 is about 3527.8236917397. The cubic root of 12445540 is about 231.7419097815.

Adding to 12445540 its reverse (4554421), we get a palindrome (16999961).

The spelling of 12445540 in words is "twelve million, four hundred forty-five thousand, five hundred forty".