195961389 has 16 divisors (see below), whose sum is σ = 282441600. Its totient is φ = 120136896.

The previous prime is 195961387. The next prime is 195961391. The reversal of 195961389 is 983169591.

It is a happy number.

195961389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (195961387) and next prime (195961391).

It is not a de Polignac number, because 195961389 - 2¹ = 195961387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195961387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1152 + ... + 19830.

It is an arithmetic number, because the mean of its divisors is an integer number (17652600).

Almost surely, 2^195961389 is an apocalyptic number.

It is an amenable number.

195961389 is a deficient number, since it is larger than the sum of its proper divisors (86480211).

195961389 is a wasteful number, since it uses less digits than its factorization.

195961389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18964.

The product of its digits is 524880, while the sum is 51.

The square root of 195961389 is about 13998.6209677954. The cubic root of 195961389 is about 580.8404274797.

The spelling of 195961389 in words is "one hundred ninety-five million, nine hundred sixty-one thousand, three hundred eighty-nine".