1843421 has 2 divisors, whose sum is σ = 1843422. Its totient is φ = 1843420.

The previous prime is 1843357. The next prime is 1843423. The reversal of 1843421 is 1243481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1836025 + 7396 = 1355^2 + 86^2 .

It is an emirp because it is prime and its reverse (1243481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1843421 - 2⁶ = 1843357 is a prime.

Together with 1843423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1843423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 921710 + 921711.

It is an arithmetic number, because the mean of its divisors is an integer number (921711).

2^1843421 is an apocalyptic number.

It is an amenable number.

1843421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1843421 is an equidigital number, since it uses as much as digits as its factorization.

1843421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 23.

The square root of 1843421 is about 1357.7264083754. The cubic root of 1843421 is about 122.6144092876.

The spelling of 1843421 in words is "one million, eight hundred forty-three thousand, four hundred twenty-one".