195999999 has 16 divisors (see below), whose sum is σ = 282240000. Its totient is φ = 120270816.

The previous prime is 195999959. The next prime is 196000001. The reversal of 195999999 is 999999591.

It is a Cunningham number, because it is equal to 14000²-1.

It is not a de Polignac number, because 195999999 - 2⁷ = 195999871 is a prime.

195999999 is a modest number, since divided by 99999 gives 1959 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195999929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7002 + ... + 21000.

It is an arithmetic number, because the mean of its divisors is an integer number (17640000).

Almost surely, 2^195999999 is an apocalyptic number.

195999999 is a deficient number, since it is larger than the sum of its proper divisors (86240001).

195999999 is a wasteful number, since it uses less digits than its factorization.

195999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14374.

The product of its digits is 23914845, while the sum is 69.

The square root of 195999999 is about 13999.9999642857. Note that the first 4 decimals coincide. The cubic root of 195999999 is about 580.8785723685.

The spelling of 195999999 in words is "one hundred ninety-five million, nine hundred ninety-nine thousand, nine hundred ninety-nine".