243427 has 4 divisors (see below), whose sum is σ = 244720. Its totient is φ = 242136.

The previous prime is 243421. The next prime is 243431. The reversal of 243427 is 724342.

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

It is a cyclic number.

It is not a de Polignac number, because 243427 - 2¹⁵ = 210659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243398 and 243407.

It is not an unprimeable number, because it can be changed into a prime (243421) 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, 303 + ... + 760.

It is an arithmetic number, because the mean of its divisors is an integer number (61180).

2²⁴³⁴²⁷ is an apocalyptic number.

243427 is a deficient number, since it is larger than the sum of its proper divisors (1293).

243427 is a wasteful number, since it uses less digits than its factorization.

243427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292.

The product of its digits is 1344, while the sum is 22.

The square root of 243427 is about 493.3832181986. The cubic root of 243427 is about 62.4390445703.

Adding to 243427 its reverse (724342), we get a palindrome (967769).

The spelling of 243427 in words is "two hundred forty-three thousand, four hundred twenty-seven", and thus it is an iban number.