209930 has 16 divisors (see below), whose sum is σ = 432000. Its totient is φ = 71952.

The previous prime is 209929. The next prime is 209939. The reversal of 209930 is 39902.

209930 = T₃ + T₄ + ... + T₁₀₇.

It is a junction number, because it is equal to n+sod(n) for n = 209896 and 209905.

It is not an unprimeable number, because it can be changed into a prime (209939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1430 + ... + 1569.

It is an arithmetic number, because the mean of its divisors is an integer number (27000).

2²⁰⁹⁹³⁰ is an apocalyptic number.

209930 is an abundant number, since it is smaller than the sum of its proper divisors (222070).

It is a weird number, because it is abundant, but not a pseudoperfect number.

209930 is a wasteful number, since it uses less digits than its factorization.

209930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3013.

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

The square root of 209930 is about 458.1811868683. The cubic root of 209930 is about 59.4326144360.

The spelling of 209930 in words is "two hundred nine thousand, nine hundred thirty".