6721349 has 4 divisors (see below), whose sum is σ = 6728736. Its totient is φ = 6713964.

The previous prime is 6721343. The next prime is 6721361. The reversal of 6721349 is 9431276.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6721349 - 2⁴ = 6721333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721343) 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, 2099 + ... + 4224.

It is an arithmetic number, because the mean of its divisors is an integer number (1682184).

Almost surely, 2^6721349 is an apocalyptic number.

It is an amenable number.

6721349 is a deficient number, since it is larger than the sum of its proper divisors (7387).

6721349 is a wasteful number, since it uses less digits than its factorization.

6721349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7386.

The product of its digits is 9072, while the sum is 32.

The square root of 6721349 is about 2592.5564603302. The cubic root of 6721349 is about 188.7203856876.

The spelling of 6721349 in words is "six million, seven hundred twenty-one thousand, three hundred forty-nine".