199187042 has 8 divisors (see below), whose sum is σ = 298897500. Its totient is φ = 99554544.

The previous prime is 199187041. The next prime is 199187101. The reversal of 199187042 is 240781991.

It can be written as a sum of positive squares in 2 ways, for example, as 191296561 + 7890481 = 13831^2 + 2809^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (199187041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12617 + ... + 23612.

Almost surely, 2^199187042 is an apocalyptic number.

199187042 is a deficient number, since it is larger than the sum of its proper divisors (99710458).

199187042 is a wasteful number, since it uses less digits than its factorization.

199187042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38980.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 199187042 is about 14113.3639505258. The cubic root of 199187042 is about 584.0101037377.

The spelling of 199187042 in words is "one hundred ninety-nine million, one hundred eighty-seven thousand, forty-two".