12839421 has 24 divisors (see below), whose sum is σ = 20966880. Its totient is φ = 6949152.

The previous prime is 12839419. The next prime is 12839429. The reversal of 12839421 is 12493821.

It is not a de Polignac number, because 12839421 - 2¹ = 12839419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12839429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 495 + ... + 5091.

It is an arithmetic number, because the mean of its divisors is an integer number (873620).

Almost surely, 2^12839421 is an apocalyptic number.

It is an amenable number.

12839421 is a deficient number, since it is larger than the sum of its proper divisors (8127459).

12839421 is a wasteful number, since it uses less digits than its factorization.

12839421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4633 (or 4626 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 12839421 is about 3583.2137809514. The cubic root of 12839421 is about 234.1613140004.

The spelling of 12839421 in words is "twelve million, eight hundred thirty-nine thousand, four hundred twenty-one".