195985439 has 4 divisors (see below), whose sum is σ = 211061256. Its totient is φ = 180909624.

The previous prime is 195985429. The next prime is 195985457. The reversal of 195985439 is 934589591.

It is a happy number.

195985439 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 an emirpimes, since its reverse is a distinct semiprime: 934589591 = 13 ⋅71891507.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195985439 is a prime.

It is a Duffinian number.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195985429) 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, 7537889 + ... + 7537914.

It is an arithmetic number, because the mean of its divisors is an integer number (52765314).

Almost surely, 2^195985439 is an apocalyptic number.

195985439 is a deficient number, since it is larger than the sum of its proper divisors (15075817).

195985439 is a wasteful number, since it uses less digits than its factorization.

195985439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15075816.

The product of its digits is 1749600, while the sum is 53.

The square root of 195985439 is about 13999.4799546269. The cubic root of 195985439 is about 580.8641883523.

The spelling of 195985439 in words is "one hundred ninety-five million, nine hundred eighty-five thousand, four hundred thirty-nine".