243808345 has 24 divisors (see below), whose sum is σ = 329462280. Its totient is φ = 172972800.

The previous prime is 243808343. The next prime is 243808403. The reversal of 243808345 is 543808342.

243808345 = T₂₉₅₀ + T₂₉₅₁ + ... + T₃₀₀₄.

It can be written as a sum of positive squares in 4 ways, for example, as 18688329 + 225120016 = 4323^2 + 15004^2 .

It is not a de Polignac number, because 243808345 - 2¹ = 243808343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243808343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19891 + ... + 29719.

It is an arithmetic number, because the mean of its divisors is an integer number (13727595).

Almost surely, 2^243808345 is an apocalyptic number.

It is an amenable number.

243808345 is a deficient number, since it is larger than the sum of its proper divisors (85653935).

243808345 is a wasteful number, since it uses less digits than its factorization.

243808345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9897 (or 9886 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

The square root of 243808345 is about 15614.3634196211. The cubic root of 243808345 is about 624.7163256657.

The spelling of 243808345 in words is "two hundred forty-three million, eight hundred eight thousand, three hundred forty-five".