6862721 has 4 divisors (see below), whose sum is σ = 6879444. Its totient is φ = 6846000.

The previous prime is 6862711. The next prime is 6862727. The reversal of 6862721 is 1272686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1272686 = 2 ⋅636343.

It can be written as a sum of positive squares in 2 ways, for example, as 2283121 + 4579600 = 1511^2 + 2140^2 .

It is a cyclic number.

It is not a de Polignac number, because 6862721 - 2¹⁰ = 6861697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6862727) 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 in 3 ways as a sum of consecutive naturals, for example, 7730 + ... + 8571.

It is an arithmetic number, because the mean of its divisors is an integer number (1719861).

Almost surely, 2^6862721 is an apocalyptic number.

It is an amenable number.

6862721 is a deficient number, since it is larger than the sum of its proper divisors (16723).

6862721 is a wasteful number, since it uses less digits than its factorization.

6862721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16722.

The product of its digits is 8064, while the sum is 32.

The square root of 6862721 is about 2619.6795605570. The cubic root of 6862721 is about 190.0343520528.

The spelling of 6862721 in words is "six million, eight hundred sixty-two thousand, seven hundred twenty-one".