199643393 has 16 divisors (see below), whose sum is σ = 225587520. Its totient is φ = 175550976.

The previous prime is 199643383. The next prime is 199643399. The reversal of 199643393 is 393346991.

It is not a de Polignac number, because 199643393 - 2⁶ = 199643329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199643399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19346 + ... + 27812.

It is an arithmetic number, because the mean of its divisors is an integer number (14099220).

Almost surely, 2^199643393 is an apocalyptic number.

It is an amenable number.

199643393 is a deficient number, since it is larger than the sum of its proper divisors (25944127).

199643393 is a wasteful number, since it uses less digits than its factorization.

199643393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8576.

The product of its digits is 472392, while the sum is 47.

The square root of 199643393 is about 14129.5220372099. The cubic root of 199643393 is about 584.4557657937.

The spelling of 199643393 in words is "one hundred ninety-nine million, six hundred forty-three thousand, three hundred ninety-three".