209473873 has 16 divisors (see below), whose sum is σ = 252720000. Its totient is φ = 173349456.

The previous prime is 209473867. The next prime is 209473883. The reversal of 209473873 is 378374902.

It is not a de Polignac number, because 209473873 - 2²⁵ = 175919441 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209473853) 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, 583 + ... + 20476.

It is an arithmetic number, because the mean of its divisors is an integer number (15795000).

Almost surely, 2^209473873 is an apocalyptic number.

It is an amenable number.

209473873 is a deficient number, since it is larger than the sum of its proper divisors (43246127).

209473873 is an equidigital number, since it uses as much as digits as its factorization.

209473873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21109 (or 21095 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 209473873 is about 14473.2122557503. The cubic root of 209473873 is about 593.8953900209.

The spelling of 209473873 in words is "two hundred nine million, four hundred seventy-three thousand, eight hundred seventy-three".