13843421 has 2 divisors, whose sum is σ = 13843422. Its totient is φ = 13843420.

The previous prime is 13843397. The next prime is 13843433. The reversal of 13843421 is 12434831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 264196 = 3685^2 + 514^2 .

It is an emirp because it is prime and its reverse (12434831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13843421 - 2¹⁰ = 13842397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13843451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6921710 + 6921711.

It is an arithmetic number, because the mean of its divisors is an integer number (6921711).

Almost surely, 2^13843421 is an apocalyptic number.

It is an amenable number.

13843421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13843421 is an equidigital number, since it uses as much as digits as its factorization.

13843421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 26.

The square root of 13843421 is about 3720.6748043870. The cubic root of 13843421 is about 240.1123374560.

The spelling of 13843421 in words is "thirteen million, eight hundred forty-three thousand, four hundred twenty-one".