6738221 has 4 divisors (see below), whose sum is σ = 7700832. Its totient is φ = 5775612.

The previous prime is 6738203. The next prime is 6738223. The reversal of 6738221 is 1228376.

It is a happy number.

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 6738221 - 2²² = 2543917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6738223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 481295 + ... + 481308.

It is an arithmetic number, because the mean of its divisors is an integer number (1925208).

Almost surely, 2^6738221 is an apocalyptic number.

It is an amenable number.

6738221 is a deficient number, since it is larger than the sum of its proper divisors (962611).

6738221 is an equidigital number, since it uses as much as digits as its factorization.

6738221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962610.

The product of its digits is 4032, while the sum is 29.

The square root of 6738221 is about 2595.8083519397. The cubic root of 6738221 is about 188.8781630331.

The spelling of 6738221 in words is "six million, seven hundred thirty-eight thousand, two hundred twenty-one".