243808403 has 2 divisors, whose sum is σ = 243808404. Its totient is φ = 243808402.

The previous prime is 243808343. The next prime is 243808417. The reversal of 243808403 is 304808342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243808403 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243808403.

It is not a weakly prime, because it can be changed into another prime (243808483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121904201 + 121904202.

It is an arithmetic number, because the mean of its divisors is an integer number (121904202).

Almost surely, 2^243808403 is an apocalyptic number.

243808403 is a deficient number, since it is larger than the sum of its proper divisors (1).

243808403 is an equidigital number, since it uses as much as digits as its factorization.

243808403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 243808403 is about 15614.3652768853. The cubic root of 243808403 is about 624.7163752040.

The spelling of 243808403 in words is "two hundred forty-three million, eight hundred eight thousand, four hundred three".