243686340 has 96 divisors (see below), whose sum is σ = 767410560. Its totient is φ = 64188288.

The previous prime is 243686297. The next prime is 243686341. The reversal of 243686340 is 43686342.

It is a happy number.

243686340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 243686295 and 243686304.

It is not an unprimeable number, because it can be changed into a prime (243686341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42102 + ... + 47538.

It is an arithmetic number, because the mean of its divisors is an integer number (7993860).

Almost surely, 2^243686340 is an apocalyptic number.

243686340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243686340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383705280).

243686340 is an abundant number, since it is smaller than the sum of its proper divisors (523724220).

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

243686340 is a wasteful number, since it uses less digits than its factorization.

243686340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5538 (or 5530 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 243686340 is about 15610.4561112096. The cubic root of 243686340 is about 624.6121027737.

The spelling of 243686340 in words is "two hundred forty-three million, six hundred eighty-six thousand, three hundred forty".