12224720 has 20 divisors (see below), whose sum is σ = 28422660. Its totient is φ = 4889856.

The previous prime is 12224701. The next prime is 12224731. The reversal of 12224720 is 2742221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4227136 + 7997584 = 2056^2 + 2828^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12224692 and 12224701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76325 + ... + 76484.

It is an arithmetic number, because the mean of its divisors is an integer number (1421133).

Almost surely, 2^12224720 is an apocalyptic number.

12224720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12224720 is an abundant number, since it is smaller than the sum of its proper divisors (16197940).

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

12224720 is a wasteful number, since it uses less digits than its factorization.

12224720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152822 (or 152816 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 12224720 is about 3496.3867063012. The cubic root of 12224720 is about 230.3631314785.

Adding to 12224720 its reverse (2742221), we get a palindrome (14966941).

It can be divided in two parts, 122 and 24720, that added together give a palindrome (24842).

The spelling of 12224720 in words is "twelve million, two hundred twenty-four thousand, seven hundred twenty".