243647 has 2 divisors, whose sum is σ = 243648. Its totient is φ = 243646.

The previous prime is 243643. The next prime is 243671. The reversal of 243647 is 746342.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243647 - 2² = 243643 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121823 + 121824.

It is an arithmetic number, because the mean of its divisors is an integer number (121824).

2²⁴³⁶⁴⁷ is an apocalyptic number.

243647 is a deficient number, since it is larger than the sum of its proper divisors (1).

243647 is an equidigital number, since it uses as much as digits as its factorization.

243647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 26.

The square root of 243647 is about 493.6061182765. The cubic root of 243647 is about 62.4578489123.

Adding to 243647 its reverse (746342), we get a palindrome (989989).

The spelling of 243647 in words is "two hundred forty-three thousand, six hundred forty-seven".