12813224 has 8 divisors (see below), whose sum is σ = 24024810. Its totient is φ = 6406608.

The previous prime is 12813217. The next prime is 12813253. The reversal of 12813224 is 42231821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12124324 + 688900 = 3482^2 + 830^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 12813224.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800819 + ... + 800834.

Almost surely, 2^12813224 is an apocalyptic number.

It is an amenable number.

12813224 is a deficient number, since it is larger than the sum of its proper divisors (11211586).

12813224 is a wasteful number, since it uses less digits than its factorization.

12813224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601659 (or 1601655 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 12813224 is about 3579.5563970973. The cubic root of 12813224 is about 234.0019480199.

The spelling of 12813224 in words is "twelve million, eight hundred thirteen thousand, two hundred twenty-four".