243909236 has 6 divisors (see below), whose sum is σ = 426841170. Its totient is φ = 121954616.

The previous prime is 243909229. The next prime is 243909269. The reversal of 243909236 is 632909342.

It can be written as a sum of positive squares in only one way, i.e., 132480100 + 111429136 = 11510^2 + 10556^2 .

It is a super-2 number, since 2×243909236² = 118983430812207392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243909236.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 30488651 + ... + 30488658.

It is an arithmetic number, because the mean of its divisors is an integer number (71140195).

Almost surely, 2^243909236 is an apocalyptic number.

It is an amenable number.

243909236 is a deficient number, since it is larger than the sum of its proper divisors (182931934).

243909236 is a wasteful number, since it uses less digits than its factorization.

243909236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60977313 (or 60977311 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 243909236 is about 15617.5937967409. The cubic root of 243909236 is about 624.8024856408.

The spelling of 243909236 in words is "two hundred forty-three million, nine hundred nine thousand, two hundred thirty-six".