199745585 has 12 divisors (see below), whose sum is σ = 258280092. Its totient is φ = 147420288.

The previous prime is 199745561. The next prime is 199745587. The reversal of 199745585 is 585547991.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 119159056 + 80586529 = 10916^2 + 8977^2 .

It is not a de Polignac number, because 199745585 - 2¹² = 199741489 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 (199745587) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113069 + ... + 114821.

It is an arithmetic number, because the mean of its divisors is an integer number (21523341).

Almost surely, 2^199745585 is an apocalyptic number.

It is an amenable number.

199745585 is a deficient number, since it is larger than the sum of its proper divisors (58534507).

199745585 is an frugal number, since it uses more digits than its factorization.

199745585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3524 (or 1771 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 53.

The square root of 199745585 is about 14133.1378327674. The cubic root of 199745585 is about 584.5554710979. Note that the first 3 decimals are identical.

The spelling of 199745585 in words is "one hundred ninety-nine million, seven hundred forty-five thousand, five hundred eighty-five".