243432403 has 2 divisors, whose sum is σ = 243432404. Its totient is φ = 243432402.

The previous prime is 243432379. The next prime is 243432421. The reversal of 243432403 is 304234342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243432403 is a prime.

It is not a weakly prime, because it can be changed into another prime (243432463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121716201 + 121716202.

It is an arithmetic number, because the mean of its divisors is an integer number (121716202).

Almost surely, 2^243432403 is an apocalyptic number.

243432403 is a deficient number, since it is larger than the sum of its proper divisors (1).

243432403 is an equidigital number, since it uses as much as digits as its factorization.

243432403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 25.

The square root of 243432403 is about 15602.3204363966. The cubic root of 243432403 is about 624.3950652352.

Adding to 243432403 its reverse (304234342), we get a palindrome (547666745).

The spelling of 243432403 in words is "two hundred forty-three million, four hundred thirty-two thousand, four hundred three".