243792009 has 12 divisors (see below), whose sum is σ = 364287300. Its totient is φ = 156923424.

The previous prime is 243791993. The next prime is 243792011. The reversal of 243792009 is 900297342.

It can be written as a sum of positive squares in 2 ways, for example, as 153066384 + 90725625 = 12372^2 + 9525^2 .

It is not a de Polignac number, because 243792009 - 2⁴ = 243791993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243792079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 466774 + ... + 467295.

It is an arithmetic number, because the mean of its divisors is an integer number (30357275).

Almost surely, 2^243792009 is an apocalyptic number.

243792009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

243792009 is a deficient number, since it is larger than the sum of its proper divisors (120495291).

243792009 is a wasteful number, since it uses less digits than its factorization.

243792009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934104 (or 934101 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 243792009 is about 15613.8403027570. The cubic root of 243792009 is about 624.7023726379.

The spelling of 243792009 in words is "two hundred forty-three million, seven hundred ninety-two thousand, nine".