Search a number
-
+
12205 = 52441
BaseRepresentation
bin10111110101101
3121202001
42332231
5342310
6132301
750404
oct27655
917661
1012205
119196
127091
13572b
14463b
15393a
hex2fad

12205 has 4 divisors (see below), whose sum is σ = 14652. Its totient is φ = 9760.

The previous prime is 12203. The next prime is 12211. The reversal of 12205 is 50221.

12205 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2601 + 9604 = 51^2 + 98^2 .

It is not a de Polignac number, because 12205 - 21 = 12203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12191 and 12200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1216 + ... + 1225.

It is an arithmetic number, because the mean of its divisors is an integer number (3663).

212205 is an apocalyptic number.

It is an amenable number.

12205 is a deficient number, since it is larger than the sum of its proper divisors (2447).

12205 is an equidigital number, since it uses as much as digits as its factorization.

12205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 12205 is about 110.4762417898. The cubic root of 12205 is about 23.0239196647.

Adding to 12205 its reverse (50221), we get a palindrome (62426).

It can be divided in two parts, 1220 and 5, that added together give a triangular number (1225 = T49).

The spelling of 12205 in words is "twelve thousand, two hundred five".

Divisors: 1 5 2441 12205