243668 has 6 divisors (see below), whose sum is σ = 426426. Its totient is φ = 121832.

The previous prime is 243647. The next prime is 243671. The reversal of 243668 is 866342.

It can be written as a sum of positive squares in only one way, i.e., 158404 + 85264 = 398^2 + 292^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243668.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30455 + ... + 30462.

It is an arithmetic number, because the mean of its divisors is an integer number (71071).

2²⁴³⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

243668 is a deficient number, since it is larger than the sum of its proper divisors (182758).

243668 is a wasteful number, since it uses less digits than its factorization.

243668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60921 (or 60919 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 243668 is about 493.6273898397. The cubic root of 243668 is about 62.4596432803.

The spelling of 243668 in words is "two hundred forty-three thousand, six hundred sixty-eight".