12520224 has 96 divisors (see below), whose sum is σ = 37477440. Its totient is φ = 4064256.

The previous prime is 12520219. The next prime is 12520237. The reversal of 12520224 is 42202521.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12520197 and 12520206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36984 + ... + 37320.

It is an arithmetic number, because the mean of its divisors is an integer number (390390).

Almost surely, 2^12520224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12520224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18738720).

12520224 is an abundant number, since it is smaller than the sum of its proper divisors (24957216).

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

12520224 is a wasteful number, since it uses less digits than its factorization.

12520224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 12520224 is about 3538.3928555207. The cubic root of 12520224 is about 232.2045362306.

Adding to 12520224 its reverse (42202521), we get a palindrome (54722745).

The spelling of 12520224 in words is "twelve million, five hundred twenty thousand, two hundred twenty-four".