12533440 has 56 divisors (see below), whose sum is σ = 30449520. Its totient is φ = 4912128.

The previous prime is 12533377. The next prime is 12533441. The reversal of 12533440 is 4433521.

It is not an unprimeable number, because it can be changed into a prime (12533441) 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, 16591 + ... + 17329.

Almost surely, 2^12533440 is an apocalyptic number.

12533440 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 12533440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15224760).

12533440 is an abundant number, since it is smaller than the sum of its proper divisors (17916080).

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

12533440 is an equidigital number, since it uses as much as digits as its factorization.

12533440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 12533440 is about 3540.2598774666. The cubic root of 12533440 is about 232.2862103817.

Adding to 12533440 its reverse (4433521), we get a palindrome (16966961).

The spelling of 12533440 in words is "twelve million, five hundred thirty-three thousand, four hundred forty".