12545440 has 48 divisors (see below), whose sum is σ = 30005640. Its totient is φ = 4956160.

The previous prime is 12545417. The next prime is 12545447. The reversal of 12545440 is 4454521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6012304 + 6533136 = 2452^2 + 2556^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12545447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13800 + ... + 14680.

Almost surely, 2^12545440 is an apocalyptic number.

12545440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12545440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15002820).

12545440 is an abundant number, since it is smaller than the sum of its proper divisors (17460200).

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

12545440 is an equidigital number, since it uses as much as digits as its factorization.

12545440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985 (or 977 counting only the distinct ones).

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

The square root of 12545440 is about 3541.9542628329. The cubic root of 12545440 is about 232.3603200009.

Adding to 12545440 its reverse (4454521), we get a palindrome (16999961).

The spelling of 12545440 in words is "twelve million, five hundred forty-five thousand, four hundred forty".