27243 has 8 divisors (see below), whose sum is σ = 40400. Its totient is φ = 18144.

The previous prime is 27241. The next prime is 27253. The reversal of 27243 is 34272.

It is a happy number.

It is not a de Polignac number, because 27243 - 2¹ = 27241 is a prime.

It is an Ulam number.

It is a Duffinian number.

27243 is a modest number, since divided by 243 gives 27 as remainder.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (27241) 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, 478 + ... + 531.

It is an arithmetic number, because the mean of its divisors is an integer number (5050).

2²⁷²⁴³ is an apocalyptic number.

27243 is a deficient number, since it is larger than the sum of its proper divisors (13157).

27243 is a wasteful number, since it uses less digits than its factorization.

27243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018 (or 1012 counting only the distinct ones).

The product of its digits is 336, while the sum is 18.

The square root of 27243 is about 165.0545364417. The cubic root of 27243 is about 30.0897313420.

Adding to 27243 its sum of digits (18), we get a triangular number (27261 = T₂₃₃).

Subtracting from 27243 its sum of digits (18), we obtain a square (27225 = 165²).

It can be divided in two parts, 27 and 243, that multiplied together give a 8-th power (6561 = 3⁸).

The spelling of 27243 in words is "twenty-seven thousand, two hundred forty-three", and thus it is an iban number.