199821802 has 4 divisors (see below), whose sum is σ = 299732706. Its totient is φ = 99910900.

The previous prime is 199821799. The next prime is 199821829. The reversal of 199821802 is 208128991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 156275001 + 43546801 = 12501^2 + 6599^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49955449 + ... + 49955452.

Almost surely, 2^199821802 is an apocalyptic number.

199821802 is a deficient number, since it is larger than the sum of its proper divisors (99910904).

199821802 is an equidigital number, since it uses as much as digits as its factorization.

199821802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99910903.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 199821802 is about 14135.8339690306. The cubic root of 199821802 is about 584.6298113289.

The spelling of 199821802 in words is "one hundred ninety-nine million, eight hundred twenty-one thousand, eight hundred two".