199345805 has 4 divisors (see below), whose sum is σ = 239214972. Its totient is φ = 159476640.

The previous prime is 199345789. The next prime is 199345829. The reversal of 199345805 is 508543991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508543991 = 151 ⋅3367841.

It can be written as a sum of positive squares in 2 ways, for example, as 30891364 + 168454441 = 5558^2 + 12979^2 .

It is not a de Polignac number, because 199345805 - 2⁴ = 199345789 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19934576 + ... + 19934585.

It is an arithmetic number, because the mean of its divisors is an integer number (59803743).

Almost surely, 2^199345805 is an apocalyptic number.

It is an amenable number.

199345805 is a deficient number, since it is larger than the sum of its proper divisors (39869167).

199345805 is an equidigital number, since it uses as much as digits as its factorization.

199345805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39869166.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 199345805 is about 14118.9873928692. The cubic root of 199345805 is about 584.1652252289.

The spelling of 199345805 in words is "one hundred ninety-nine million, three hundred forty-five thousand, eight hundred five".