199880978 has 8 divisors (see below), whose sum is σ = 327078000. Its totient is φ = 90854980.

The previous prime is 199880977. The next prime is 199880983. The reversal of 199880978 is 879088991.

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

It is not an unprimeable number, because it can be changed into a prime (199880977) 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, 4542728 + ... + 4542771.

It is an arithmetic number, because the mean of its divisors is an integer number (40884750).

Almost surely, 2^199880978 is an apocalyptic number.

199880978 is a deficient number, since it is larger than the sum of its proper divisors (127197022).

199880978 is a wasteful number, since it uses less digits than its factorization.

199880978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9085512.

The product of its (nonzero) digits is 2612736, while the sum is 59.

The square root of 199880978 is about 14137.9269343140. The cubic root of 199880978 is about 584.6875171428.

The spelling of 199880978 in words is "one hundred ninety-nine million, eight hundred eighty thousand, nine hundred seventy-eight".