390209 has 2 divisors, whose sum is σ = 390210. Its totient is φ = 390208.

The previous prime is 390199. The next prime is 390211. The reversal of 390209 is 902093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207025 + 183184 = 455^2 + 428^2 .

It is a cyclic number.

It is not a de Polignac number, because 390209 - 2⁴ = 390193 is a prime.

Together with 390211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (390289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195104 + 195105.

It is an arithmetic number, because the mean of its divisors is an integer number (195105).

2³⁹⁰²⁰⁹ is an apocalyptic number.

It is an amenable number.

390209 is a deficient number, since it is larger than the sum of its proper divisors (1).

390209 is an equidigital number, since it uses as much as digits as its factorization.

390209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 390209 is about 624.6671113481. The cubic root of 390209 is about 73.0744845553.

The spelling of 390209 in words is "three hundred ninety thousand, two hundred nine".