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18265 = 513281
BaseRepresentation
bin100011101011001
3221001111
410131121
51041030
6220321
7104152
oct43531
927044
1018265
11127a5
12a6a1
138410
146929
15562a
hex4759

18265 has 8 divisors (see below), whose sum is σ = 23688. Its totient is φ = 13440.

The previous prime is 18257. The next prime is 18269. The reversal of 18265 is 56281.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 841 + 17424 = 29^2 + 132^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18265 - 23 = 18257 is a prime.

It is a super-2 number, since 2×182652 = 667220450, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18269) 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, 76 + ... + 205.

It is an arithmetic number, because the mean of its divisors is an integer number (2961).

18265 is a Friedman number, since it can be written as 281*65, using all its digits and the basic arithmetic operations.

218265 is an apocalyptic number.

It is an amenable number.

18265 is a deficient number, since it is larger than the sum of its proper divisors (5423).

18265 is a wasteful number, since it uses less digits than its factorization.

18265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299.

The product of its digits is 480, while the sum is 22.

The square root of 18265 is about 135.1480669488. The cubic root of 18265 is about 26.3353983675.

The spelling of 18265 in words is "eighteen thousand, two hundred sixty-five".

Divisors: 1 5 13 65 281 1405 3653 18265