6867721 has 8 divisors (see below), whose sum is σ = 8262080. Its totient is φ = 5576688.

The previous prime is 6867667. The next prime is 6867733. The reversal of 6867721 is 1277686.

It is a happy number.

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 6867721 - 2¹⁹ = 6343433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6867761) 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, 25686 + ... + 25951.

It is an arithmetic number, because the mean of its divisors is an integer number (1032760).

Almost surely, 2^6867721 is an apocalyptic number.

It is an amenable number.

6867721 is a deficient number, since it is larger than the sum of its proper divisors (1394359).

6867721 is a wasteful number, since it uses less digits than its factorization.

6867721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51663.

The product of its digits is 28224, while the sum is 37.

The square root of 6867721 is about 2620.6337019889. The cubic root of 6867721 is about 190.0804922110.

The spelling of 6867721 in words is "six million, eight hundred sixty-seven thousand, seven hundred twenty-one".