195866 has 16 divisors (see below), whose sum is σ = 332640. Its totient is φ = 85680.

The previous prime is 195863. The next prime is 195869. The reversal of 195866 is 668591.

195866 = 44² + 45² + ... + 87².

It is an interprime number because it is at equal distance from previous prime (195863) and next prime (195869).

It is a Curzon number.

It is a nialpdrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 195866.

It is not an unprimeable number, because it can be changed into a prime (195863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485 + ... + 791.

It is an arithmetic number, because the mean of its divisors is an integer number (20790).

2¹⁹⁵⁸⁶⁶ is an apocalyptic number.

195866 is a deficient number, since it is larger than the sum of its proper divisors (136774).

195866 is a wasteful number, since it uses less digits than its factorization.

195866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349.

The product of its digits is 12960, while the sum is 35.

The square root of 195866 is about 442.5675089746. The cubic root of 195866 is about 58.0746166087.

It can be divided in two parts, 19 and 5866, that added together give a palindrome (5885).

The spelling of 195866 in words is "one hundred ninety-five thousand, eight hundred sixty-six".