195990427 has 2 divisors, whose sum is σ = 195990428. Its totient is φ = 195990426.

The previous prime is 195990413. The next prime is 195990437. The reversal of 195990427 is 724099591.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195990427 is a prime.

It is not a weakly prime, because it can be changed into another prime (195990437) 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 as a sum of consecutive naturals, namely, 97995213 + 97995214.

It is an arithmetic number, because the mean of its divisors is an integer number (97995214).

Almost surely, 2^195990427 is an apocalyptic number.

195990427 is a deficient number, since it is larger than the sum of its proper divisors (1).

195990427 is an equidigital number, since it uses as much as digits as its factorization.

195990427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 195990427 is about 13999.6581029681. The cubic root of 195990427 is about 580.8691161436.

The spelling of 195990427 in words is "one hundred ninety-five million, nine hundred ninety thousand, four hundred twenty-seven".