12581240 has 80 divisors (see below), whose sum is σ = 33275880. Its totient is φ = 4280640.

The previous prime is 12581237. The next prime is 12581243. The reversal of 12581240 is 4218521.

It is an interprime number because it is at equal distance from previous prime (12581237) and next prime (12581243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 95975 + ... + 96105.

Almost surely, 2^12581240 is an apocalyptic number.

12581240 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 12581240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16637940).

12581240 is an abundant number, since it is smaller than the sum of its proper divisors (20694640).

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

12581240 is an equidigital number, since it uses as much as digits as its factorization.

12581240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 12581240 is about 3547.0043698874. The cubic root of 12581240 is about 232.5811332831.

Adding to 12581240 its reverse (4218521), we get a palindrome (16799761).

It can be divided in two parts, 12581 and 240, that added together give a palindrome (12821).

The spelling of 12581240 in words is "twelve million, five hundred eighty-one thousand, two hundred forty".