13231224 has 48 divisors (see below), whose sum is σ = 36101520. Its totient is φ = 4377600.

The previous prime is 13231189. The next prime is 13231247. The reversal of 13231224 is 42213231.

13231224 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 13231197 and 13231206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10264 + ... + 11480.

It is an arithmetic number, because the mean of its divisors is an integer number (752115).

Almost surely, 2^13231224 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 13231224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18050760).

13231224 is an abundant number, since it is smaller than the sum of its proper divisors (22870296).

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

13231224 is a wasteful number, since it uses less digits than its factorization.

13231224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380 (or 1373 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 13231224 is about 3637.4749483673. The cubic root of 13231224 is about 236.5193484640.

Adding to 13231224 its reverse (42213231), we get a palindrome (55444455).

The spelling of 13231224 in words is "thirteen million, two hundred thirty-one thousand, two hundred twenty-four".