243693 has 6 divisors (see below), whose sum is σ = 352014. Its totient is φ = 162456.

The previous prime is 243673. The next prime is 243701. The reversal of 243693 is 396342.

It can be written as a sum of positive squares in only one way, i.e., 233289 + 10404 = 483^2 + 102^2 .

It is not a de Polignac number, because 243693 - 2⁸ = 243437 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 4⁸ + 6 + 3⁵ + 9³ + 3¹¹ .

It is a Curzon number.

243693 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243693.

It is not an unprimeable number, because it can be changed into a prime (243613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13530 + ... + 13547.

It is an arithmetic number, because the mean of its divisors is an integer number (58669).

2²⁴³⁶⁹³ is an apocalyptic number.

It is an amenable number.

243693 is a deficient number, since it is larger than the sum of its proper divisors (108321).

243693 is a wasteful number, since it uses less digits than its factorization.

243693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27083 (or 27080 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 243693 is about 493.6527119342. The cubic root of 243693 is about 62.4617792983.

The spelling of 243693 in words is "two hundred forty-three thousand, six hundred ninety-three".