12512440 has 32 divisors (see below), whose sum is σ = 28435680. Its totient is φ = 4954752.

The previous prime is 12512417. The next prime is 12512443. The reversal of 12512440 is 4421521.

It is a super-2 number, since 2×12512440² = 313122309507200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12512443) 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, 2602 + ... + 5638.

It is an arithmetic number, because the mean of its divisors is an integer number (888615).

Almost surely, 2^12512440 is an apocalyptic number.

12512440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12512440 is an abundant number, since it is smaller than the sum of its proper divisors (15923240).

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

12512440 is a wasteful number, since it uses less digits than its factorization.

12512440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3151 (or 3147 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 12512440 is about 3537.2927501127. The cubic root of 12512440 is about 232.1564046419.

Adding to 12512440 its reverse (4421521), we get a palindrome (16933961).

The spelling of 12512440 in words is "twelve million, five hundred twelve thousand, four hundred forty".