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8215 = 53153
BaseRepresentation
bin10000000010111
3102021021
42000113
5230330
6102011
732644
oct20027
912237
108215
116199
124907
13397c
142dcb
15267a
hex2017

8215 has 8 divisors (see below), whose sum is σ = 10368. Its totient is φ = 6240.

The previous prime is 8209. The next prime is 8219. The reversal of 8215 is 5128.

8215 = 162 + 172 + ... + 302.

It is a happy number.

8215 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 not a de Polignac number, because 8215 - 27 = 8087 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129 + ... + 181.

It is an arithmetic number, because the mean of its divisors is an integer number (1296).

28215 is an apocalyptic number.

8215 is a deficient number, since it is larger than the sum of its proper divisors (2153).

8215 is a wasteful number, since it uses less digits than its factorization.

8215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89.

The product of its digits is 80, while the sum is 16.

The square root of 8215 is about 90.6366371839. The cubic root of 8215 is about 20.1775851749.

The spelling of 8215 in words is "eight thousand, two hundred fifteen".

Divisors: 1 5 31 53 155 265 1643 8215