199971078 has 8 divisors (see below), whose sum is σ = 399942168. Its totient is φ = 66657024.

The previous prime is 199971077. The next prime is 199971127. The reversal of 199971078 is 870179991.

199971078 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.

199971078 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 199971078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199971077) 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, 16664251 + ... + 16664262.

It is an arithmetic number, because the mean of its divisors is an integer number (49992771).

Almost surely, 2^199971078 is an apocalyptic number.

199971078 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

199971078 is a wasteful number, since it uses less digits than its factorization.

199971078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33328518.

The product of its (nonzero) digits is 285768, while the sum is 51.

The square root of 199971078 is about 14141.1130396444. The cubic root of 199971078 is about 584.7753568033.

The spelling of 199971078 in words is "one hundred ninety-nine million, nine hundred seventy-one thousand, seventy-eight".