199821466 has 16 divisors (see below), whose sum is σ = 324579528. Its totient is φ = 91713600.

The previous prime is 199821463. The next prime is 199821467. The reversal of 199821466 is 664128991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 143496441 + 56325025 = 11979^2 + 7505^2 .

It is not an unprimeable number, because it can be changed into a prime (199821463) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16525 + ... + 25936.

Almost surely, 2^199821466 is an apocalyptic number.

199821466 is a deficient number, since it is larger than the sum of its proper divisors (124758062).

199821466 is a wasteful number, since it uses less digits than its factorization.

199821466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42657.

The product of its digits is 186624, while the sum is 46.

The square root of 199821466 is about 14135.8220843360. The cubic root of 199821466 is about 584.6294836441.

The spelling of 199821466 in words is "one hundred ninety-nine million, eight hundred twenty-one thousand, four hundred sixty-six".