199880687 has 2 divisors, whose sum is σ = 199880688. Its totient is φ = 199880686.

The previous prime is 199880609. The next prime is 199880689. The reversal of 199880687 is 786088991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199880687 - 2¹⁰ = 199879663 is a prime.

Together with 199880689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199880689) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99940343 + 99940344.

It is an arithmetic number, because the mean of its divisors is an integer number (99940344).

Almost surely, 2^199880687 is an apocalyptic number.

199880687 is a deficient number, since it is larger than the sum of its proper divisors (1).

199880687 is an equidigital number, since it uses as much as digits as its factorization.

199880687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 56.

The square root of 199880687 is about 14137.9166428438. The cubic root of 199880687 is about 584.6872334004.

The spelling of 199880687 in words is "one hundred ninety-nine million, eight hundred eighty thousand, six hundred eighty-seven".