6730421 has 4 divisors (see below), whose sum is σ = 7023072. Its totient is φ = 6437772.

The previous prime is 6730391. The next prime is 6730463. The reversal of 6730421 is 1240376.

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 6730421 - 2⁶ = 6730357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 292627 = 6730421 / (6 + 7 + 3 + 0 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6730481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146291 + ... + 146336.

It is an arithmetic number, because the mean of its divisors is an integer number (1755768).

Almost surely, 2^6730421 is an apocalyptic number.

It is an amenable number.

6730421 is a deficient number, since it is larger than the sum of its proper divisors (292651).

6730421 is a wasteful number, since it uses less digits than its factorization.

6730421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292650.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 6730421 is about 2594.3054947326. The cubic root of 6730421 is about 188.8052546446.

Adding to 6730421 its reverse (1240376), we get a palindrome (7970797).

The spelling of 6730421 in words is "six million, seven hundred thirty thousand, four hundred twenty-one".