199880985 has 32 divisors (see below), whose sum is σ = 346515840. Its totient is φ = 97993728.

The previous prime is 199880983. The next prime is 199880999. The reversal of 199880985 is 589088991.

It is not a de Polignac number, because 199880985 - 2¹ = 199880983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199880983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1851 + ... + 20079.

It is an arithmetic number, because the mean of its divisors is an integer number (10828620).

Almost surely, 2^199880985 is an apocalyptic number.

199880985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199880985 is a deficient number, since it is larger than the sum of its proper divisors (146634855).

199880985 is a wasteful number, since it uses less digits than its factorization.

199880985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18297.

The product of its (nonzero) digits is 1866240, while the sum is 57.

The square root of 199880985 is about 14137.9271818750. The cubic root of 199880985 is about 584.6875239682.

The spelling of 199880985 in words is "one hundred ninety-nine million, eight hundred eighty thousand, nine hundred eighty-five".