199800393842 has 12 divisors (see below), whose sum is σ = 348631299630. Its totient is φ = 85628740176.

The previous prime is 199800393839. The next prime is 199800393889. The reversal of 199800393842 is 248393008991.

It can be written as a sum of positive squares in only one way, i.e., 104664543361 + 95135850481 = 323519^2 + 308441^2 .

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 5 ways as a sum of consecutive naturals, for example, 1019389667 + ... + 1019389862.

Almost surely, 2^199800393842 is an apocalyptic number.

199800393842 is a deficient number, since it is larger than the sum of its proper divisors (148830905788).

199800393842 is a wasteful number, since it uses less digits than its factorization.

199800393842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038779545 (or 2038779538 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 56.

The spelling of 199800393842 in words is "one hundred ninety-nine billion, eight hundred million, three hundred ninety-three thousand, eight hundred forty-two".