12838421 has 4 divisors (see below), whose sum is σ = 12858912. Its totient is φ = 12817932.

The previous prime is 12838411. The next prime is 12838429. The reversal of 12838421 is 12483821.

12838421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12838421 - 2¹⁴ = 12822037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12838429) 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, 9275 + ... + 10568.

It is an arithmetic number, because the mean of its divisors is an integer number (3214728).

Almost surely, 2^12838421 is an apocalyptic number.

It is an amenable number.

12838421 is a deficient number, since it is larger than the sum of its proper divisors (20491).

12838421 is an equidigital number, since it uses as much as digits as its factorization.

12838421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20490.

The product of its digits is 3072, while the sum is 29.

The square root of 12838421 is about 3583.0742386950. The cubic root of 12838421 is about 234.1552346143.

The spelling of 12838421 in words is "twelve million, eight hundred thirty-eight thousand, four hundred twenty-one".