8382721 has 8 divisors (see below), whose sum is σ = 8616960. Its totient is φ = 8150352.

The previous prime is 8382719. The next prime is 8382727. The reversal of 8382721 is 1272838.

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 8382721 - 2¹ = 8382719 is a prime.

It is a super-2 number, since 2×8382721² = 140540022727682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8382727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16215 + ... + 16723.

It is an arithmetic number, because the mean of its divisors is an integer number (1077120).

Almost surely, 2^8382721 is an apocalyptic number.

It is an amenable number.

8382721 is a deficient number, since it is larger than the sum of its proper divisors (234239).

8382721 is a wasteful number, since it uses less digits than its factorization.

8382721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935.

The product of its digits is 5376, while the sum is 31.

The square root of 8382721 is about 2895.2929040082. The cubic root of 8382721 is about 203.1397922482.

The spelling of 8382721 in words is "eight million, three hundred eighty-two thousand, seven hundred twenty-one".