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12215 = 57349
BaseRepresentation
bin10111110110111
3121202102
42332313
5342330
6132315
750420
oct27667
917672
1012215
1191a5
12709b
135738
144647
153945
hex2fb7

12215 has 8 divisors (see below), whose sum is σ = 16800. Its totient is φ = 8352.

The previous prime is 12211. The next prime is 12227. The reversal of 12215 is 51221.

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 12215 - 22 = 12211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12196 and 12205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140 + ... + 209.

It is an arithmetic number, because the mean of its divisors is an integer number (2100).

12215 is a deficient number, since it is larger than the sum of its proper divisors (4585).

12215 is an equidigital number, since it uses as much as digits as its factorization.

12215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361.

The product of its digits is 20, while the sum is 11.

The square root of 12215 is about 110.5214911228. The cubic root of 12215 is about 23.0302060595.

Adding to 12215 its reverse (51221), we get a palindrome (63436).

It can be divided in two parts, 1221 and 5, that multiplied together give a triangular number (6105 = T110).

The spelling of 12215 in words is "twelve thousand, two hundred fifteen".

Divisors: 1 5 7 35 349 1745 2443 12215