195973787 has 2 divisors, whose sum is σ = 195973788. Its totient is φ = 195973786.

The previous prime is 195973783. The next prime is 195973801. The reversal of 195973787 is 787379591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195973787 - 2² = 195973783 is a prime.

It is a super-2 number, since 2×195973787² = 76811450382242738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (195973781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97986893 + 97986894.

It is an arithmetic number, because the mean of its divisors is an integer number (97986894).

Almost surely, 2^195973787 is an apocalyptic number.

195973787 is a deficient number, since it is larger than the sum of its proper divisors (1).

195973787 is an equidigital number, since it uses as much as digits as its factorization.

195973787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3333960, while the sum is 56.

The square root of 195973787 is about 13999.0637901254. The cubic root of 195973787 is about 580.8526766746.

The spelling of 195973787 in words is "one hundred ninety-five million, nine hundred seventy-three thousand, seven hundred eighty-seven".