199680879 has 4 divisors (see below), whose sum is σ = 266241176. Its totient is φ = 133120584.

The previous prime is 199680857. The next prime is 199680881. The reversal of 199680879 is 978086991.

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

It is a de Polignac number, because none of the positive numbers 2^k-199680879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199680809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33280144 + ... + 33280149.

It is an arithmetic number, because the mean of its divisors is an integer number (66560294).

Almost surely, 2^199680879 is an apocalyptic number.

199680879 is a deficient number, since it is larger than the sum of its proper divisors (66560297).

199680879 is an equidigital number, since it uses as much as digits as its factorization.

199680879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66560296.

The product of its (nonzero) digits is 1959552, while the sum is 57.

The square root of 199680879 is about 14130.8484883251. The cubic root of 199680879 is about 584.4923435760.

The spelling of 199680879 in words is "one hundred ninety-nine million, six hundred eighty thousand, eight hundred seventy-nine".