6721247 has 8 divisors (see below), whose sum is σ = 7311360. Its totient is φ = 6141600.

The previous prime is 6721237. The next prime is 6721259. The reversal of 6721247 is 7421276.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6721247 - 2²⁰ = 5672671 is a prime.

It is a super-2 number, since 2×6721247² = 90350322470018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1247 + ... + 3872.

It is an arithmetic number, because the mean of its divisors is an integer number (913920).

Almost surely, 2^6721247 is an apocalyptic number.

6721247 is a deficient number, since it is larger than the sum of its proper divisors (590113).

6721247 is a wasteful number, since it uses less digits than its factorization.

6721247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233.

The product of its digits is 4704, while the sum is 29.

The square root of 6721247 is about 2592.5367885529. The cubic root of 6721247 is about 188.7194310391.

Adding to 6721247 its sum of digits (29), we get a palindrome (6721276).

The spelling of 6721247 in words is "six million, seven hundred twenty-one thousand, two hundred forty-seven".