195307989 has 4 divisors (see below), whose sum is σ = 260410656. Its totient is φ = 130205324.

The previous prime is 195307979. The next prime is 195307993. The reversal of 195307989 is 989703591.

It is a happy number.

195307989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 195307989 - 2⁸ = 195307733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195307979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32551329 + ... + 32551334.

It is an arithmetic number, because the mean of its divisors is an integer number (65102664).

Almost surely, 2^195307989 is an apocalyptic number.

It is an amenable number.

195307989 is a deficient number, since it is larger than the sum of its proper divisors (65102667).

195307989 is an equidigital number, since it uses as much as digits as its factorization.

195307989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65102666.

The product of its (nonzero) digits is 612360, while the sum is 51.

The square root of 195307989 is about 13975.2634679994. The cubic root of 195307989 is about 580.1941373497.

The spelling of 195307989 in words is "one hundred ninety-five million, three hundred seven thousand, nine hundred eighty-nine".