199678793 has 2 divisors, whose sum is σ = 199678794. Its totient is φ = 199678792.

The previous prime is 199678769. The next prime is 199678819. The reversal of 199678793 is 397876991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130256569 + 69422224 = 11413^2 + 8332^2 .

It is a cyclic number.

It is not a de Polignac number, because 199678793 - 2⁸ = 199678537 is a prime.

It is a super-4 number, since 4×199678793⁴ (a number of 34 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (199671793) 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 as a sum of consecutive naturals, namely, 99839396 + 99839397.

It is an arithmetic number, because the mean of its divisors is an integer number (99839397).

Almost surely, 2^199678793 is an apocalyptic number.

It is an amenable number.

199678793 is a deficient number, since it is larger than the sum of its proper divisors (1).

199678793 is an equidigital number, since it uses as much as digits as its factorization.

199678793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5143824, while the sum is 59.

The square root of 199678793 is about 14130.7746779856. The cubic root of 199678793 is about 584.4903082363.

The spelling of 199678793 in words is "one hundred ninety-nine million, six hundred seventy-eight thousand, seven hundred ninety-three".