6825721 has 16 divisors (see below), whose sum is σ = 8467200. Its totient is φ = 5368320.

The previous prime is 6825703. The next prime is 6825737. The reversal of 6825721 is 1275286.

It is a cyclic number.

It is not a de Polignac number, because 6825721 - 2¹³ = 6817529 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6825761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4180 + ... + 5578.

It is an arithmetic number, because the mean of its divisors is an integer number (529200).

Almost surely, 2^6825721 is an apocalyptic number.

It is an amenable number.

6825721 is a deficient number, since it is larger than the sum of its proper divisors (1641479).

6825721 is a wasteful number, since it uses less digits than its factorization.

6825721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464.

The product of its digits is 6720, while the sum is 31.

The square root of 6825721 is about 2612.6080838886. The cubic root of 6825721 is about 189.6922163677.

The spelling of 6825721 in words is "six million, eight hundred twenty-five thousand, seven hundred twenty-one".