199820842 has 16 divisors (see below), whose sum is σ = 326418120. Its totient is φ = 91187712.

The previous prime is 199820821. The next prime is 199820861. The reversal of 199820842 is 248028991.

It can be written as a sum of positive squares in 4 ways, for example, as 158231241 + 41589601 = 12579^2 + 6449^2 .

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 7 ways as a sum of consecutive naturals, for example, 40863 + ... + 45490.

Almost surely, 2^199820842 is an apocalyptic number.

199820842 is a deficient number, since it is larger than the sum of its proper divisors (126597278).

199820842 is a wasteful number, since it uses less digits than its factorization.

199820842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86457.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 199820842 is about 14135.8000127336. The cubic root of 199820842 is about 584.6288750856.

The spelling of 199820842 in words is "one hundred ninety-nine million, eight hundred twenty thousand, eight hundred forty-two".