199293903978 has 32 divisors (see below), whose sum is σ = 429992437056. Its totient is φ = 61214911488.

The previous prime is 199293903917. The next prime is 199293903983. The reversal of 199293903978 is 879309392991.

199293903978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2169076 + ... + 2259087.

It is an arithmetic number, because the mean of its divisors is an integer number (13437263658).

Almost surely, 2^199293903978 is an apocalyptic number.

199293903978 is an abundant number, since it is smaller than the sum of its proper divisors (230698533078).

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

199293903978 is a wasteful number, since it uses less digits than its factorization.

199293903978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428758.

The product of its (nonzero) digits is 59521392, while the sum is 69.

The spelling of 199293903978 in words is "one hundred ninety-nine billion, two hundred ninety-three million, nine hundred three thousand, nine hundred seventy-eight".