199672987 has 4 divisors (see below), whose sum is σ = 199724616. Its totient is φ = 199621360.

The previous prime is 199672981. The next prime is 199672999. The reversal of 199672987 is 789276991.

It is a happy number.

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 199672987 - 2²⁷ = 65455259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199672981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19498 + ... + 27919.

It is an arithmetic number, because the mean of its divisors is an integer number (49931154).

Almost surely, 2^199672987 is an apocalyptic number.

199672987 is a deficient number, since it is larger than the sum of its proper divisors (51629).

199672987 is an equidigital number, since it uses as much as digits as its factorization.

199672987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51628.

The product of its digits is 3429216, while the sum is 58.

The square root of 199672987 is about 14130.5692383570. The cubic root of 199672987 is about 584.4846431653.

The spelling of 199672987 in words is "one hundred ninety-nine million, six hundred seventy-two thousand, nine hundred eighty-seven".