195982987 has 4 divisors (see below), whose sum is σ = 207511416. Its totient is φ = 184454560.

The previous prime is 195982951. The next prime is 195982991. The reversal of 195982987 is 789289591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789289591 = 6073 ⋅129967.

It is a cyclic number.

It is not a de Polignac number, because 195982987 - 2⁷ = 195982859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195982907) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5764189 + ... + 5764222.

It is an arithmetic number, because the mean of its divisors is an integer number (51877854).

Almost surely, 2^195982987 is an apocalyptic number.

195982987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

195982987 is a deficient number, since it is larger than the sum of its proper divisors (11528429).

195982987 is a wasteful number, since it uses less digits than its factorization.

195982987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11528428.

The product of its digits is 3265920, while the sum is 58.

The square root of 195982987 is about 13999.3923796713. The cubic root of 195982987 is about 580.8617659191.

The spelling of 195982987 in words is "one hundred ninety-five million, nine hundred eighty-two thousand, nine hundred eighty-seven".