8182721 has 8 divisors (see below), whose sum is σ = 8334144. Its totient is φ = 8032720.

The previous prime is 8182709. The next prime is 8182753. The reversal of 8182721 is 1272818.

8182721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8182721 - 2¹⁰ = 8181697 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 (8182781) 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, 25655 + ... + 25971.

It is an arithmetic number, because the mean of its divisors is an integer number (1041768).

Almost surely, 2^8182721 is an apocalyptic number.

It is an amenable number.

8182721 is a deficient number, since it is larger than the sum of its proper divisors (151423).

8182721 is a wasteful number, since it uses less digits than its factorization.

8182721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711.

The product of its digits is 1792, while the sum is 29.

The square root of 8182721 is about 2860.5455773331. The cubic root of 8182721 is about 201.5112272005.

Subtracting from 8182721 its reverse (1272818), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 8182721 in words is "eight million, one hundred eighty-two thousand, seven hundred twenty-one".