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18365 = 53673
BaseRepresentation
bin100011110111101
3221012012
410132331
51041430
6221005
7104354
oct43675
927165
1018365
1112886
12a765
138489
14699b
155695
hex47bd

18365 has 4 divisors (see below), whose sum is σ = 22044. Its totient is φ = 14688.

The previous prime is 18353. The next prime is 18367. The reversal of 18365 is 56381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56381 = 134337.

It can be written as a sum of positive squares in 2 ways, for example, as 3481 + 14884 = 59^2 + 122^2 .

It is a cyclic number.

It is not a de Polignac number, because 18365 - 26 = 18301 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 14 and base 16.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 18365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18367) 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, 1832 + ... + 1841.

It is an arithmetic number, because the mean of its divisors is an integer number (5511).

It is an amenable number.

18365 is a deficient number, since it is larger than the sum of its proper divisors (3679).

18365 is an equidigital number, since it uses as much as digits as its factorization.

18365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3678.

The product of its digits is 720, while the sum is 23.

The square root of 18365 is about 135.5175265418. The cubic root of 18365 is about 26.3833726030.

It can be divided in two parts, 1836 and 5, that multiplied together give a triangular number (9180 = T135).

The spelling of 18365 in words is "eighteen thousand, three hundred sixty-five".

Divisors: 1 5 3673 18365