205973209 has 8 divisors (see below), whose sum is σ = 225128960. Its totient is φ = 187290576.

The previous prime is 205973197. The next prime is 205973219. The reversal of 205973209 is 902379502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205973209 - 2⁷ = 205973081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205973219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117369 + ... + 119110.

It is an arithmetic number, because the mean of its divisors is an integer number (28141120).

Almost surely, 2^205973209 is an apocalyptic number.

It is an amenable number.

205973209 is a deficient number, since it is larger than the sum of its proper divisors (19155751).

205973209 is a wasteful number, since it uses less digits than its factorization.

205973209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236559.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 205973209 is about 14351.7667553511. The cubic root of 205973209 is about 590.5684543311.

The spelling of 205973209 in words is "two hundred five million, nine hundred seventy-three thousand, two hundred nine".