243669 has 4 divisors (see below), whose sum is σ = 324896. Its totient is φ = 162444.

The previous prime is 243647. The next prime is 243671. The reversal of 243669 is 966342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 243669 - 2⁹ = 243157 is a prime.

It is a super-2 number, since 2×243669² = 118749163122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

243669 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40609 + ... + 40614.

It is an arithmetic number, because the mean of its divisors is an integer number (81224).

2²⁴³⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

243669 is a deficient number, since it is larger than the sum of its proper divisors (81227).

243669 is an equidigital number, since it uses as much as digits as its factorization.

243669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81226.

The product of its digits is 7776, while the sum is 30.

The square root of 243669 is about 493.6284027485. The cubic root of 243669 is about 62.4597287238.

The spelling of 243669 in words is "two hundred forty-three thousand, six hundred sixty-nine".