199395866 has 8 divisors (see below), whose sum is σ = 299273940. Its totient is φ = 99637888.

The previous prime is 199395799. The next prime is 199395877. The reversal of 199395866 is 668593991.

It can be written as a sum of positive squares in 2 ways, for example, as 194463025 + 4932841 = 13945^2 + 2221^2 .

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

It is a super-2 number, since 2×199395866² = 79517422755779912, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 25751 + ... + 32586.

Almost surely, 2^199395866 is an apocalyptic number.

199395866 is a deficient number, since it is larger than the sum of its proper divisors (99878074).

199395866 is a wasteful number, since it uses less digits than its factorization.

199395866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60048.

The product of its digits is 3149280, while the sum is 56.

The square root of 199395866 is about 14120.7601070197. The cubic root of 199395866 is about 584.2141209116.

The spelling of 199395866 in words is "one hundred ninety-nine million, three hundred ninety-five thousand, eight hundred sixty-six".