423504209 has 2 divisors, whose sum is σ = 423504210. Its totient is φ = 423504208.

The previous prime is 423504163. The next prime is 423504217. The reversal of 423504209 is 902405324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423207184 + 297025 = 20572^2 + 545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423504209 is a prime.

It is not a weakly prime, because it can be changed into another prime (423504229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211752104 + 211752105.

It is an arithmetic number, because the mean of its divisors is an integer number (211752105).

Almost surely, 2^423504209 is an apocalyptic number.

It is an amenable number.

423504209 is a deficient number, since it is larger than the sum of its proper divisors (1).

423504209 is an equidigital number, since it uses as much as digits as its factorization.

423504209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 423504209 is about 20579.2178908723. The cubic root of 423504209 is about 750.9642170346.

The spelling of 423504209 in words is "four hundred twenty-three million, five hundred four thousand, two hundred nine".