12443220 has 60 divisors (see below), whose sum is σ = 39039924. Its totient is φ = 3317760.

The previous prime is 12443219. The next prime is 12443231. The reversal of 12443220 is 2234421.

12443220 is a `hidden beast` number, since 1 + 2 + 443 + 220 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6625476 + 5817744 = 2574^2 + 2412^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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 = 12443193 and 12443202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2221 + ... + 5460.

Almost surely, 2^12443220 is an apocalyptic number.

12443220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12443220 is an abundant number, since it is smaller than the sum of its proper divisors (26596704).

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

12443220 is a wasteful number, since it uses less digits than its factorization.

12443220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7702 (or 7691 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 12443220 is about 3527.4948617964. The cubic root of 12443220 is about 231.7275090500.

Adding to 12443220 its reverse (2234421), we get a palindrome (14677641).

The spelling of 12443220 in words is "twelve million, four hundred forty-three thousand, two hundred twenty".