9780205 has 8 divisors (see below), whose sum is σ = 11779704. Its totient is φ = 7795200.

The previous prime is 9780203. The next prime is 9780217. The reversal of 9780205 is 5020879.

It can be written as a sum of positive squares in 4 ways, for example, as 2778889 + 7001316 = 1667^2 + 2646^2 .

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

It is not a de Polignac number, because 9780205 - 2¹ = 9780203 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 (9780203) 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, 2076 + ... + 4885.

It is an arithmetic number, because the mean of its divisors is an integer number (1472463).

Almost surely, 2^9780205 is an apocalyptic number.

It is an amenable number.

9780205 is a deficient number, since it is larger than the sum of its proper divisors (1999499).

9780205 is a wasteful number, since it uses less digits than its factorization.

9780205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 9780205 is about 3127.3319299364. The cubic root of 9780205 is about 213.8533146235.

The spelling of 9780205 in words is "nine million, seven hundred eighty thousand, two hundred five".