380520209 has 2 divisors, whose sum is σ = 380520210. Its totient is φ = 380520208.

The previous prime is 380520193. The next prime is 380520229. The reversal of 380520209 is 902025083.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320302609 + 60217600 = 17897^2 + 7760^2 .

It is a cyclic number.

It is not a de Polignac number, because 380520209 - 2⁴ = 380520193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (380520229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190260104 + 190260105.

It is an arithmetic number, because the mean of its divisors is an integer number (190260105).

Almost surely, 2^380520209 is an apocalyptic number.

It is an amenable number.

380520209 is a deficient number, since it is larger than the sum of its proper divisors (1).

380520209 is an equidigital number, since it uses as much as digits as its factorization.

380520209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 380520209 is about 19506.9272054827. The cubic root of 380520209 is about 724.6460160169.

The spelling of 380520209 in words is "three hundred eighty million, five hundred twenty thousand, two hundred nine".