201830209 has 16 divisors (see below), whose sum is σ = 237911040. Its totient is φ = 167645520.

The previous prime is 201830203. The next prime is 201830257. The reversal of 201830209 is 902038102.

201830209 = T₇₂ + T₇₃ + ... + T₁₀₆₅.

It is not a de Polignac number, because 201830209 - 2⁷ = 201830081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201830203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25882 + ... + 32764.

It is an arithmetic number, because the mean of its divisors is an integer number (14869440).

Almost surely, 2^201830209 is an apocalyptic number.

It is an amenable number.

201830209 is a deficient number, since it is larger than the sum of its proper divisors (36080831).

201830209 is an equidigital number, since it uses as much as digits as its factorization.

201830209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7020.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 201830209 is about 14206.6959212901. The cubic root of 201830209 is about 586.5819882876.

The spelling of 201830209 in words is "two hundred one million, eight hundred thirty thousand, two hundred nine".