199693729 has 2 divisors, whose sum is σ = 199693730. Its totient is φ = 199693728.

The previous prime is 199693721. The next prime is 199693787. The reversal of 199693729 is 927396991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197458704 + 2235025 = 14052^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 199693729 - 2³ = 199693721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199693729.

It is not a weakly prime, because it can be changed into another prime (199693721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99846864 + 99846865.

It is an arithmetic number, because the mean of its divisors is an integer number (99846865).

Almost surely, 2^199693729 is an apocalyptic number.

It is an amenable number.

199693729 is a deficient number, since it is larger than the sum of its proper divisors (1).

199693729 is an equidigital number, since it uses as much as digits as its factorization.

199693729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1653372, while the sum is 55.

The square root of 199693729 is about 14131.3031600062. The cubic root of 199693729 is about 584.5048811903.

The spelling of 199693729 in words is "one hundred ninety-nine million, six hundred ninety-three thousand, seven hundred twenty-nine".