6393421 has 2 divisors, whose sum is σ = 6393422. Its totient is φ = 6393420.

The previous prime is 6393403. The next prime is 6393433. The reversal of 6393421 is 1243936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3944196 + 2449225 = 1986^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 6393421 - 2⁷ = 6393293 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6393421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6393461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3196710 + 3196711.

It is an arithmetic number, because the mean of its divisors is an integer number (3196711).

Almost surely, 2^6393421 is an apocalyptic number.

It is an amenable number.

6393421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6393421 is an equidigital number, since it uses as much as digits as its factorization.

6393421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 6393421 is about 2528.5215047533. The cubic root of 6393421 is about 185.5999127557.

The spelling of 6393421 in words is "six million, three hundred ninety-three thousand, four hundred twenty-one".