199994887 has 4 divisors (see below), whose sum is σ = 200032456. Its totient is φ = 199957320.

The previous prime is 199994881. The next prime is 199994897. The reversal of 199994887 is 788499991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199994887 - 2¹¹ = 199992839 is a prime.

It is a super-2 number, since 2×199994887² = 79995909652285538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199994881) 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, 9153 + ... + 21994.

It is an arithmetic number, because the mean of its divisors is an integer number (50008114).

Almost surely, 2^199994887 is an apocalyptic number.

199994887 is a deficient number, since it is larger than the sum of its proper divisors (37569).

199994887 is an equidigital number, since it uses as much as digits as its factorization.

199994887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37568.

The product of its digits is 11757312, while the sum is 64.

The square root of 199994887 is about 14141.9548507270. The cubic root of 199994887 is about 584.7985640992.

The spelling of 199994887 in words is "one hundred ninety-nine million, nine hundred ninety-four thousand, eight hundred eighty-seven".