395971687 has 2 divisors, whose sum is σ = 395971688. Its totient is φ = 395971686.

The previous prime is 395971661. The next prime is 395971699. The reversal of 395971687 is 786179593.

It is a strong prime.

It is an emirp because it is prime and its reverse (786179593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 395971687 - 2⁷ = 395971559 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395971787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197985843 + 197985844.

It is an arithmetic number, because the mean of its divisors is an integer number (197985844).

Almost surely, 2^395971687 is an apocalyptic number.

395971687 is a deficient number, since it is larger than the sum of its proper divisors (1).

395971687 is an equidigital number, since it uses as much as digits as its factorization.

395971687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 55.

The square root of 395971687 is about 19899.0373385247. The cubic root of 395971687 is about 734.3245445872.

The spelling of 395971687 in words is "three hundred ninety-five million, nine hundred seventy-one thousand, six hundred eighty-seven".