199543906 has 8 divisors (see below), whose sum is σ = 312329664. Its totient is φ = 95434020.

The previous prime is 199543901. The next prime is 199543913. The reversal of 199543906 is 609345991.

199543906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 4337911 = 199543906 / (1 + 9 + 9 + 5 + 4 + 3 + 9 + 0 + 6).

It is not an unprimeable number, because it can be changed into a prime (199543901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2168910 + ... + 2169001.

It is an arithmetic number, because the mean of its divisors is an integer number (39041208).

Almost surely, 2^199543906 is an apocalyptic number.

199543906 is a deficient number, since it is larger than the sum of its proper divisors (112785758).

199543906 is a wasteful number, since it uses less digits than its factorization.

199543906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337936.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 199543906 is about 14126.0010618717. The cubic root of 199543906 is about 584.3586669766.

The spelling of 199543906 in words is "one hundred ninety-nine million, five hundred forty-three thousand, nine hundred six".