12428421 has 8 divisors (see below), whose sum is σ = 16589280. Its totient is φ = 8276592.

The previous prime is 12428401. The next prime is 12428431. The reversal of 12428421 is 12482421.

12428421 is digitally balanced in base 2, 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 12428421 - 2⁵ = 12428389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12428391 and 12428400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12428401) 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, 2235 + ... + 5463.

It is an arithmetic number, because the mean of its divisors is an integer number (2073660).

Almost surely, 2^12428421 is an apocalyptic number.

It is an amenable number.

12428421 is a deficient number, since it is larger than the sum of its proper divisors (4160859).

12428421 is a wasteful number, since it uses less digits than its factorization.

12428421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4515.

The product of its digits is 1024, while the sum is 24.

The square root of 12428421 is about 3525.3965734368. The cubic root of 12428421 is about 231.6356063690.

The spelling of 12428421 in words is "twelve million, four hundred twenty-eight thousand, four hundred twenty-one".