195999421 has 8 divisors (see below), whose sum is σ = 208320320. Its totient is φ = 183879072.

The previous prime is 195999407. The next prime is 195999473. The reversal of 195999421 is 124999591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195999421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195999521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48120 + ... + 52033.

It is an arithmetic number, because the mean of its divisors is an integer number (26040040).

Almost surely, 2^195999421 is an apocalyptic number.

It is an amenable number.

195999421 is a deficient number, since it is larger than the sum of its proper divisors (12320899).

195999421 is a wasteful number, since it uses less digits than its factorization.

195999421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100275.

The product of its digits is 262440, while the sum is 49.

The square root of 195999421 is about 13999.9793214133. The cubic root of 195999421 is about 580.8780013682.

The spelling of 195999421 in words is "one hundred ninety-five million, nine hundred ninety-nine thousand, four hundred twenty-one".