199471887 has 18 divisors (see below), whose sum is σ = 297733176. Its totient is φ = 128685960.

The previous prime is 199471841. The next prime is 199471903. The reversal of 199471887 is 788174991.

199471887 is a `hidden beast` number, since 1 + 99 + 471 + 8 + 87 = 666.

It is not a de Polignac number, because 199471887 - 2⁸ = 199471631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199471837) 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 17 ways as a sum of consecutive naturals, for example, 2883 + ... + 20180.

It is an arithmetic number, because the mean of its divisors is an integer number (16540732).

Almost surely, 2^199471887 is an apocalyptic number.

199471887 is a deficient number, since it is larger than the sum of its proper divisors (98261289).

199471887 is a wasteful number, since it uses less digits than its factorization.

199471887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23131 (or 23097 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The square root of 199471887 is about 14123.4516673510. The cubic root of 199471887 is about 584.2883566511.

The spelling of 199471887 in words is "one hundred ninety-nine million, four hundred seventy-one thousand, eight hundred eighty-seven".