12784220 has 12 divisors (see below), whose sum is σ = 26846904. Its totient is φ = 5113680.

The previous prime is 12784217. The next prime is 12784229. The reversal of 12784220 is 2248721.

It is a self number, because there is not a number n which added to its sum of digits gives 12784220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12784229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319586 + ... + 319625.

It is an arithmetic number, because the mean of its divisors is an integer number (2237242).

Almost surely, 2^12784220 is an apocalyptic number.

12784220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12784220 is an abundant number, since it is smaller than the sum of its proper divisors (14062684).

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

12784220 is a wasteful number, since it uses less digits than its factorization.

12784220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639220 (or 639218 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 12784220 is about 3575.5027618504. The cubic root of 12784220 is about 233.8252524446.

The spelling of 12784220 in words is "twelve million, seven hundred eighty-four thousand, two hundred twenty".