199380978 has 24 divisors (see below), whose sum is σ = 436449468. Its totient is φ = 65774592.

The previous prime is 199380967. The next prime is 199381009. The reversal of 199380978 is 879083991.

199380978 is a `hidden beast` number, since 199 + 380 + 9 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 193015449 + 6365529 = 13893^2 + 2523^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55351 + ... + 58842.

Almost surely, 2^199380978 is an apocalyptic number.

199380978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199380978 is an abundant number, since it is smaller than the sum of its proper divisors (237068490).

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

199380978 is a wasteful number, since it uses less digits than its factorization.

199380978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114298 (or 114295 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 199380978 is about 14120.2329300901. The cubic root of 199380978 is about 584.1995803288.

The spelling of 199380978 in words is "one hundred ninety-nine million, three hundred eighty thousand, nine hundred seventy-eight".