4380209 has 2 divisors, whose sum is σ = 4380210. Its totient is φ = 4380208.

The previous prime is 4380199. The next prime is 4380221. The reversal of 4380209 is 9020834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4293184 + 87025 = 2072^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 4380209 - 2⁴ = 4380193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4380239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2190104 + 2190105.

It is an arithmetic number, because the mean of its divisors is an integer number (2190105).

Almost surely, 2^4380209 is an apocalyptic number.

It is an amenable number.

4380209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4380209 is an equidigital number, since it uses as much as digits as its factorization.

4380209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 4380209 is about 2092.8948850814. The cubic root of 4380209 is about 163.6182001819.

The spelling of 4380209 in words is "four million, three hundred eighty thousand, two hundred nine".