199942144 has 28 divisors (see below), whose sum is σ = 399876264. Its totient is φ = 99966976.

The previous prime is 199942139. The next prime is 199942159. The reversal of 199942144 is 441249991.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 199942144.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4012 + ... + 20395.

Almost surely, 2^199942144 is an apocalyptic number.

It is an amenable number.

199942144 is a deficient number, since it is larger than the sum of its proper divisors (199934120).

199942144 is an frugal number, since it uses more digits than its factorization.

199942144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24433 (or 24409 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 199942144 is about 14140.0899572810. The cubic root of 199942144 is about 584.7471515474.

The spelling of 199942144 in words is "one hundred ninety-nine million, nine hundred forty-two thousand, one hundred forty-four".