195770987 has 4 divisors (see below), whose sum is σ = 196972200. Its totient is φ = 194569776.

The previous prime is 195770969. The next prime is 195770999. The reversal of 195770987 is 789077591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789077591 = 8699 ⋅90709.

It is a cyclic number.

It is not a de Polignac number, because 195770987 - 2²⁶ = 128662123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195770947) 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, 600362 + ... + 600687.

It is an arithmetic number, because the mean of its divisors is an integer number (49243050).

Almost surely, 2^195770987 is an apocalyptic number.

195770987 is a deficient number, since it is larger than the sum of its proper divisors (1201213).

195770987 is a wasteful number, since it uses less digits than its factorization.

195770987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201212.

The product of its (nonzero) digits is 1111320, while the sum is 53.

The square root of 195770987 is about 13991.8185737237. The cubic root of 195770987 is about 580.6522458221.

The spelling of 195770987 in words is "one hundred ninety-five million, seven hundred seventy thousand, nine hundred eighty-seven".