12784421 has 8 divisors (see below), whose sum is σ = 13874784. Its totient is φ = 11709360.

The previous prime is 12784403. The next prime is 12784427. The reversal of 12784421 is 12448721.

12784421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12784421 - 2¹⁸ = 12522277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12784427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2051 + ... + 5456.

It is an arithmetic number, because the mean of its divisors is an integer number (1734348).

Almost surely, 2^12784421 is an apocalyptic number.

It is an amenable number.

12784421 is a deficient number, since it is larger than the sum of its proper divisors (1090363).

12784421 is a wasteful number, since it uses less digits than its factorization.

12784421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7651.

The product of its digits is 3584, while the sum is 29.

The square root of 12784421 is about 3575.5308696752. The cubic root of 12784421 is about 233.8264778780.

It can be divided in two parts, 127 and 84421, that added together give a palindrome (84548).

The spelling of 12784421 in words is "twelve million, seven hundred eighty-four thousand, four hundred twenty-one".