243930 has 32 divisors (see below), whose sum is σ = 601344. Its totient is φ = 63296.

The previous prime is 243917. The next prime is 243931. The reversal of 243930 is 39342.

It is a junction number, because it is equal to n+sod(n) for n = 243897 and 243906.

It is not an unprimeable number, because it can be changed into a prime (243931) by changing a digit.

243930 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1324 + ... + 1496.

It is an arithmetic number, because the mean of its divisors is an integer number (18792).

2²⁴³⁹³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300672).

243930 is an abundant number, since it is smaller than the sum of its proper divisors (357414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243930 is a wasteful number, since it uses less digits than its factorization.

243930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 243930 is about 493.8927008977. The cubic root of 243930 is about 62.4820214955.

Adding to 243930 its sum of digits (21), we get a triangular number (243951 = T₆₉₈).

The spelling of 243930 in words is "two hundred forty-three thousand, nine hundred thirty".